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Can I execute a command(s) when a certain or any user logs in? How can I find a file on my system? How can I find certain words in files on my system? How do I decompress a .tar, .tar.gz or a .tgz file achive? How do I create a tar file achive? How do I set the blank time of my screensaver in console? How can I find and replace certain words in files? How do I ignor system messages at login? Can I make a text version of a man page? Can I ls just directorys? How do I read a floppy disk in my A:\ drive? How do I read my Windows partiton? How can I tell what filesystems my kernel supports? I just made changes to my /etc/profile. Do I have to reboot? I just made changes to my ~/.bash_profile. Do I have to reboot? How do I understand what those Linux Signal Errors mean? How do I decompress a .bz2 file archive? How do I list the number of files in the current directory? How do I list the number of subdirectories in the current directory? I cat a binary file and now my tty is unreadable. How do I fix this? How do I get back to the last directory I was in? How can I make a quick timer script? How can I talk to a User on my Linux box? How can I talk to all the Users at once on my Linux box? How can I count the lines in a file? How can I divide a number? How do I stop a crontab from emailing me? How can I have the results of a crontab be emailed to a User? How do I list files by size? How do remove blank lines from a file? How do I Add, Edit or Delete a crontab? How can I get the number of files (inodes) in all the directories in the current directory? How can I check the processes of two or more users? I have a command aliased with switches. How do I unalias it quickly? How do I kill a user and thier processes? How do a split up a file so that it will fit on floppys? How do I turn my numberlock key on at bootup? How can I list loaded modules currently in use? How do I list the contents of a tar or tar.gz file? How do prevent pico from wrapping long lines? How can I find out how much memory I am using? How can I check how much space I am using on my hard drive(s)? How can I check how much hard drive space a certain directory is using? How do I check my email with fetchmail?
Q. Can I execute a command(s) when a certain or any user logs in?A. Sure! Basicly add the following to '/etc/profile'. # EXAMPLE: USER_NAME=`whoami` case "$USER_NAME" in "root") command;; "shelly") command;; *) command;; esac # The "*" asterisk assigns the default action. # SYNTAX: case "$VARIABLE" in value1) command ;; value2) command command command ;; value3) command command ;; value4) command ;; *) command command ;; esac
Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I find a file on my system?A. Just do this at your prompt. find DirectoryName -name FileName -printf "Found file: %p \n" Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find certain words in files on my system?A. Just do this at your prompt. find DirectoryName -type f -printf "%p " | xargs egrep -i "String" | less Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .tar, .tar.gz or a .tgz file achive?A. Its simpily... tar -xzvf for a .tar.gz or .tgz file. # or... tar -xvf for a .tar file. Return to the Questions Return to the LinuxGuruz Main Page Q. How do I create a tar file achive?A. Its simpily... tar -cvf FileOrDirectory.tar FileOrDirectory # or to gzip it at the same time... tar -czvf FileOrDirectory.tgz FileOrDirectory Return to the Questions Return to the LinuxGuruz Main Page Q. How do I set the blank time of my screensaver in console?A. Usally set in /etc/rc.d/rc.M # EXAMPLE: # To make your screen blanks after 15 minutes of idle time. /bin/setterm -blank 15 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find and replace certain words in files?A. Just do this at your prompt. perl -e "s/old_string/new_string/g;" -pi.save $(find DirectoryName -type f) Return to the Questions Return to the LinuxGuruz Main Page Q. How do I ignor system messages at login?A. Just do this at your prompt. touch ~/.hushlogin Return to the Questions Return to the LinuxGuruz Main Page Q. Can I make a text version of a man page?A. Just do this at your prompt. man ManName | col -b > ManName.txt Return to the Questions Return to the LinuxGuruz Main Page Q. Can I ls just directorys?A. Just do this at your prompt. ls -l | grep "^d" Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read a floppy disk in my A:\ drive?A. Very simply. mkdir /floppy; mount -t msdos /dev/fd0 /floppy Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win Return to the Questions Return to the LinuxGuruz Main Page Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I find a file on my system?A. Just do this at your prompt. find DirectoryName -name FileName -printf "Found file: %p \n"
Q. How can I find certain words in files on my system?A. Just do this at your prompt. find DirectoryName -type f -printf "%p " | xargs egrep -i "String" | less Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .tar, .tar.gz or a .tgz file achive?A. Its simpily... tar -xzvf for a .tar.gz or .tgz file. # or... tar -xvf for a .tar file. Return to the Questions Return to the LinuxGuruz Main Page Q. How do I create a tar file achive?A. Its simpily... tar -cvf FileOrDirectory.tar FileOrDirectory # or to gzip it at the same time... tar -czvf FileOrDirectory.tgz FileOrDirectory Return to the Questions Return to the LinuxGuruz Main Page Q. How do I set the blank time of my screensaver in console?A. Usally set in /etc/rc.d/rc.M # EXAMPLE: # To make your screen blanks after 15 minutes of idle time. /bin/setterm -blank 15 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find and replace certain words in files?A. Just do this at your prompt. perl -e "s/old_string/new_string/g;" -pi.save $(find DirectoryName -type f) Return to the Questions Return to the LinuxGuruz Main Page Q. How do I ignor system messages at login?A. Just do this at your prompt. touch ~/.hushlogin Return to the Questions Return to the LinuxGuruz Main Page Q. Can I make a text version of a man page?A. Just do this at your prompt. man ManName | col -b > ManName.txt Return to the Questions Return to the LinuxGuruz Main Page Q. Can I ls just directorys?A. Just do this at your prompt. ls -l | grep "^d" Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read a floppy disk in my A:\ drive?A. Very simply. mkdir /floppy; mount -t msdos /dev/fd0 /floppy Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win Return to the Questions Return to the LinuxGuruz Main Page Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I find certain words in files on my system?A. Just do this at your prompt. find DirectoryName -type f -printf "%p " | xargs egrep -i "String" | less
Q. How do I decompress a .tar, .tar.gz or a .tgz file achive?A. Its simpily... tar -xzvf for a .tar.gz or .tgz file. # or... tar -xvf for a .tar file. Return to the Questions Return to the LinuxGuruz Main Page Q. How do I create a tar file achive?A. Its simpily... tar -cvf FileOrDirectory.tar FileOrDirectory # or to gzip it at the same time... tar -czvf FileOrDirectory.tgz FileOrDirectory Return to the Questions Return to the LinuxGuruz Main Page Q. How do I set the blank time of my screensaver in console?A. Usally set in /etc/rc.d/rc.M # EXAMPLE: # To make your screen blanks after 15 minutes of idle time. /bin/setterm -blank 15 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find and replace certain words in files?A. Just do this at your prompt. perl -e "s/old_string/new_string/g;" -pi.save $(find DirectoryName -type f) Return to the Questions Return to the LinuxGuruz Main Page Q. How do I ignor system messages at login?A. Just do this at your prompt. touch ~/.hushlogin Return to the Questions Return to the LinuxGuruz Main Page Q. Can I make a text version of a man page?A. Just do this at your prompt. man ManName | col -b > ManName.txt Return to the Questions Return to the LinuxGuruz Main Page Q. Can I ls just directorys?A. Just do this at your prompt. ls -l | grep "^d" Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read a floppy disk in my A:\ drive?A. Very simply. mkdir /floppy; mount -t msdos /dev/fd0 /floppy Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win Return to the Questions Return to the LinuxGuruz Main Page Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I decompress a .tar, .tar.gz or a .tgz file achive?A. Its simpily... tar -xzvf for a .tar.gz or .tgz file. # or... tar -xvf for a .tar file.
Q. How do I create a tar file achive?A. Its simpily... tar -cvf FileOrDirectory.tar FileOrDirectory # or to gzip it at the same time... tar -czvf FileOrDirectory.tgz FileOrDirectory Return to the Questions Return to the LinuxGuruz Main Page Q. How do I set the blank time of my screensaver in console?A. Usally set in /etc/rc.d/rc.M # EXAMPLE: # To make your screen blanks after 15 minutes of idle time. /bin/setterm -blank 15 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find and replace certain words in files?A. Just do this at your prompt. perl -e "s/old_string/new_string/g;" -pi.save $(find DirectoryName -type f) Return to the Questions Return to the LinuxGuruz Main Page Q. How do I ignor system messages at login?A. Just do this at your prompt. touch ~/.hushlogin Return to the Questions Return to the LinuxGuruz Main Page Q. Can I make a text version of a man page?A. Just do this at your prompt. man ManName | col -b > ManName.txt Return to the Questions Return to the LinuxGuruz Main Page Q. Can I ls just directorys?A. Just do this at your prompt. ls -l | grep "^d" Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read a floppy disk in my A:\ drive?A. Very simply. mkdir /floppy; mount -t msdos /dev/fd0 /floppy Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win Return to the Questions Return to the LinuxGuruz Main Page Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I create a tar file achive?A. Its simpily... tar -cvf FileOrDirectory.tar FileOrDirectory # or to gzip it at the same time... tar -czvf FileOrDirectory.tgz FileOrDirectory
Q. How do I set the blank time of my screensaver in console?A. Usally set in /etc/rc.d/rc.M # EXAMPLE: # To make your screen blanks after 15 minutes of idle time. /bin/setterm -blank 15 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find and replace certain words in files?A. Just do this at your prompt. perl -e "s/old_string/new_string/g;" -pi.save $(find DirectoryName -type f) Return to the Questions Return to the LinuxGuruz Main Page Q. How do I ignor system messages at login?A. Just do this at your prompt. touch ~/.hushlogin Return to the Questions Return to the LinuxGuruz Main Page Q. Can I make a text version of a man page?A. Just do this at your prompt. man ManName | col -b > ManName.txt Return to the Questions Return to the LinuxGuruz Main Page Q. Can I ls just directorys?A. Just do this at your prompt. ls -l | grep "^d" Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read a floppy disk in my A:\ drive?A. Very simply. mkdir /floppy; mount -t msdos /dev/fd0 /floppy Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win Return to the Questions Return to the LinuxGuruz Main Page Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I set the blank time of my screensaver in console?A. Usally set in /etc/rc.d/rc.M # EXAMPLE: # To make your screen blanks after 15 minutes of idle time. /bin/setterm -blank 15
Q. How can I find and replace certain words in files?A. Just do this at your prompt. perl -e "s/old_string/new_string/g;" -pi.save $(find DirectoryName -type f) Return to the Questions Return to the LinuxGuruz Main Page Q. How do I ignor system messages at login?A. Just do this at your prompt. touch ~/.hushlogin Return to the Questions Return to the LinuxGuruz Main Page Q. Can I make a text version of a man page?A. Just do this at your prompt. man ManName | col -b > ManName.txt Return to the Questions Return to the LinuxGuruz Main Page Q. Can I ls just directorys?A. Just do this at your prompt. ls -l | grep "^d" Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read a floppy disk in my A:\ drive?A. Very simply. mkdir /floppy; mount -t msdos /dev/fd0 /floppy Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win Return to the Questions Return to the LinuxGuruz Main Page Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I find and replace certain words in files?A. Just do this at your prompt. perl -e "s/old_string/new_string/g;" -pi.save $(find DirectoryName -type f)
Q. How do I ignor system messages at login?A. Just do this at your prompt. touch ~/.hushlogin Return to the Questions Return to the LinuxGuruz Main Page Q. Can I make a text version of a man page?A. Just do this at your prompt. man ManName | col -b > ManName.txt Return to the Questions Return to the LinuxGuruz Main Page Q. Can I ls just directorys?A. Just do this at your prompt. ls -l | grep "^d" Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read a floppy disk in my A:\ drive?A. Very simply. mkdir /floppy; mount -t msdos /dev/fd0 /floppy Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win Return to the Questions Return to the LinuxGuruz Main Page Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I ignor system messages at login?A. Just do this at your prompt. touch ~/.hushlogin
Q. Can I make a text version of a man page?A. Just do this at your prompt. man ManName | col -b > ManName.txt Return to the Questions Return to the LinuxGuruz Main Page Q. Can I ls just directorys?A. Just do this at your prompt. ls -l | grep "^d" Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read a floppy disk in my A:\ drive?A. Very simply. mkdir /floppy; mount -t msdos /dev/fd0 /floppy Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win Return to the Questions Return to the LinuxGuruz Main Page Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. Can I make a text version of a man page?A. Just do this at your prompt. man ManName | col -b > ManName.txt
Q. Can I ls just directorys?A. Just do this at your prompt. ls -l | grep "^d" Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read a floppy disk in my A:\ drive?A. Very simply. mkdir /floppy; mount -t msdos /dev/fd0 /floppy Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win Return to the Questions Return to the LinuxGuruz Main Page Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. Can I ls just directorys?A. Just do this at your prompt. ls -l | grep "^d"
Q. How do I read a floppy disk in my A:\ drive?A. Very simply. mkdir /floppy; mount -t msdos /dev/fd0 /floppy Return to the Questions Return to the LinuxGuruz Main Page Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win Return to the Questions Return to the LinuxGuruz Main Page Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I read a floppy disk in my A:\ drive?A. Very simply. mkdir /floppy; mount -t msdos /dev/fd0 /floppy
Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win Return to the Questions Return to the LinuxGuruz Main Page Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I read my Windows partiton?A. At your Linux prompt type this. mkdir /win; mount -t vfat /dev/hda1 /win
Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I tell what filesystems my kernel supports?A. Just type this at you Linux command prompt. cat /proc/filesystems
Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile Return to the Questions Return to the LinuxGuruz Main Page Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. I just made changes to my /etc/profile. Do I have to reboot?A. No you don't if you do this at your prompt. source /etc/profile
Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile Return to the Questions Return to the LinuxGuruz Main Page Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. I just made changes to my ~/.bash_profile. Do I have to reboot?A. No you don't if you do this at your prompt. source ~/.bash_profile
Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal Return to the Questions Return to the LinuxGuruz Main Page Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I understand what those Linux Signal Errors mean?A. They are listed in the man pages if you know where to look. Try... man 7 signal
Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2 Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I decompress a .bz2 file archive?A. Its simpily... bzip2 -dv FileName.bz2
Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I list the number of files in the current directory?A. At your Linux prompt type ls -la |grep "^-" |awk 'END {print "Number of files: " NR}'
Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}' Return to the Questions Return to the LinuxGuruz Main Page Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I list the number of subdirectories in the current directory?A. At your Linux prompt type ls -la |grep "^d" |awk 'END {print "Number of directories: " NR}'
Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c Return to the Questions Return to the LinuxGuruz Main Page Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. I cat a binary file and now my tty is unreadable. How do I fix this?A. Do this at your Linux prompt <Control>+v <Escape>+c
Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd - Return to the Questions Return to the LinuxGuruz Main Page Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I get back to the last directory I was in?A. Just type this at your Linux prompt cd -
Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I make a quick timer script?A. Create and run this quick BASH script #!/bin/sh tput clear while tput home; do date sleep 1 done
Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I talk to a User on my Linux box?A. At your Linux prompt who write <the user name> <the tty> <message> <message> <Control>+d
Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d Return to the Questions Return to the LinuxGuruz Main Page Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I talk to all the Users at once on my Linux box?A. At your Linux prompt wall <message> <message> <Control>+d
Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I count the lines in a file?A. At your Linux Prompt wc -l <file name>
Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc Return to the Questions Return to the LinuxGuruz Main Page Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I divide a number?A. At your Linux Prompt echo "1234567 / 2" | bc
Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1 Return to the Questions Return to the LinuxGuruz Main Page Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I stop a crontab from emailing me?A. Just add this to the end of the crontab line > /dev/null 2>&1 For example: # Run my_script every 5 minutes */5 * * * * /usr/local/bin/my_script > /dev/null 2>&1
For example:
# Run my_script every 5 minutes
Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I have the results of a crontab be emailed to a User?A. Just use mailx Syntax: [command or script] | mailx -s "Subject line" [EMAIL] For example: # Run date_script every 20 minutes */20 * * * * /bin/date_script | mailx -s "Date script cron" root
Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4 Return to the Questions Return to the LinuxGuruz Main Page Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I list files by size?A. At your Linux prompt type ls -l | sort -n +4
Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do remove blank lines from a file?A. Just use sed sed -e '/^$/d' <file with blank lines > <new file>
Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e Return to the Questions Return to the LinuxGuruz Main Page Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I Add, Edit or Delete a crontab?A. At the command prompt type crontab -e
Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \; Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I get the number of files (inodes) in all the directories in the current directory?A. Use this find command find . -xdev -type d -exec /bin/echo -n {} \; -exec sh -c "ls {} | wc -l" \;
Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>' Return to the Questions Return to the LinuxGuruz Main Page Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I check the processes of two or more users?A. Just use egrep ps -aux | egrep '<user one>|<user two>'
Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico Return to the Questions Return to the LinuxGuruz Main Page Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. I have a command aliased with switches. How do I unalias it quickly?A. Just preceed the command with a backslash '\' For example if you have an alias: alias pico='pico -w -z' Use: \pico
Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1' Return to the Questions Return to the LinuxGuruz Main Page Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I kill a user and thier processes?A. This will work nicely su - <user name> -c 'kill -9 -1'
Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do a split up a file so that it will fit on floppys?A. Use split: split -b 1400000 <file name> To reassemble use cat: cat x* > <original file name>
Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c. Return to the Questions Return to the LinuxGuruz Main Page Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I turn my numberlock key on at bootup?A. Use setleds # Example: # Use the setleds program, for example (in /etc/rc.local # or one of the /etc/rc.d/* files): for t in 1 2 3 4 5 6 7 8 do setleds +num < /dev/tty$t > /dev/null done # Alternatively, patch your kernel. You need to arrange # for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) # when compiling drivers/char/keyboard.c.
Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod Return to the Questions Return to the LinuxGuruz Main Page Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I list loaded modules currently in use?A. At your Linux prompt type: lsmod
Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz Return to the Questions Return to the LinuxGuruz Main Page Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I list the contents of a tar or tar.gz file?A. You can list the contents of a tar archive with the -t switch. To list the contents of a .tar file type: tar -tf filesname.tar To list the contents of a .tar.gz file type: tar -ztf filesname.tar.gz
Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w Return to the Questions Return to the LinuxGuruz Main Page Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do prevent pico from wrapping long lines?A. Start pico with: pico -w
Q. How can I find out how much memory I am using?A. At your Linux prompt type: free Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I find out how much memory I am using?A. At your Linux prompt type: free
Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df Return to the Questions Return to the LinuxGuruz Main Page Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I check how much space I am using on my hard drive(s)?A. At your Linux prompt type: df
Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name> Return to the Questions Return to the LinuxGuruz Main Page Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How can I check how much hard drive space a certain directory is using?A. At your Linux prompt type: du -s <directory name>
Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds> Return to the Questions Return to the LinuxGuruz Main Page
Q. How do I check my email with fetchmail?A. Create a file called ~/.fetchmailrc containing poll <mail server> proto pop3 user <user name> with pass <passwd> is <local user name> here # Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds fetchmail -d <number of seconds>
# Then set the correct permissions chmod 600 ~/.fetchmailrc # Then to fetch your email type fetchmail # Or to automaticly chech your email every so many seconds
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