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           crontab [-u user] file
           crontab [-u user] [-l | -r | -e] [-i] [-s]


           Crontab  is the program used to install, remove or list the tables used
           to drive the cron(8) daemon.  Each user can have their own crontab, and
           though  these  are  files  in /var/spool/ , they are not intended to be
           edited directly. For SELinux in mls mode can be even  more  crontabs  -
           for each range. For more see selinux(8).
           The cron jobs could be allow or disallow for different users. For clas-
           sical  crontab  there  exists  cron.allow  and  cron.deny  files.    If
           cron.allow  file exists, then you must be listed therein in order to be
           allowed to use this command.  If the cron.allow file does not exist but
           the  cron.deny  file  does  exist,  then  you must not be listed in the
           cron.deny file in order to use this command.  If neither of these files
           exists,  only  the super user will be allowed to use this command.  The
           second option is using PAM authentication,  where  you  set  up  users,
           which  could  or  couldn't  use  crontab and also system cron jobs from
           The temporary directory could be set in enviroment variables.  If  it's
           not set by user than /tmp is used.


           -u     Append  the name of the user whose crontab is to be tweaked.  If
                  this option is not given, crontab examines "your" crontab, i.e.,
                  the  crontab  of  the  person  executing the command.  Note that
                  su(8) can confuse crontab and that if you are running inside  of
                  su(8)  you  should  always  use the -u option for safety's sake.
                  The first form of this command is used to install a new  crontab
                  from  some  named  file or standard input if the pseudo-filename
                  "-" is given.
           -l     The current crontab will be displayed on standard output.
           -r     The current crontab will be removed.
           -e     This option is used to edit the current crontab using the editor
                  specified  by the VISUAL or EDITOR environment variables.  After
                  you exit from the editor, the modified crontab will be installed
           -i     This  option  modifies  the  -r  option to prompt the user for a
                  'y/Y' response before actually removing the crontab.
           -s     It will append the current SELinux security context string as an
                  MLS_LEVEL  setting to the crontab file before editing / replace-
                  ment occurs - see the documentation of MLS_LEVEL in  crontab(5).
           command line.


           Paul Vixie <>

    Marcela Maslanova 20 July 2009 CRONTAB(1)


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