LinuxGuruz
  • Last 5 Forum Topics
    Replies
    Views
    Last post


The Web Only This Site
  • BOOKMARK

  • ADD TO FAVORITES

  • REFERENCES


  • MARC

    Mailing list ARChives
    - Search by -
     Subjects
     Authors
     Bodies





    FOLDOC

    Computing Dictionary




  • Text Link Ads






  • LINUX man pages
  • Linux Man Page Viewer


    The following form allows you to view linux man pages.

    Command:

    agetty

    
    
    
    

    SYNOPSIS

           agetty  [-8ihLmnUw]  [-f  issue_file]  [-l login_program] [-I init] [-t
           timeout] [-H login_host] port baud_rate,...  [term]
           agetty [-8ihLmnw] [-f issue_file]  [-l  login_program]  [-I  init]  [-t
           timeout] [-H login_host] baud_rate,...  port [term]
    
    
    

    DESCRIPTION

           agetty  opens  a  tty  port,  prompts  for a login name and invokes the
           /bin/login command. It is normally invoked by init(8).
    
           agetty has several non-standard features that are useful for hard-wired
           and for dial-in lines:
    
           o      Adapts  the tty settings to parity bits and to erase, kill, end-
                  of-line and uppercase characters when it  reads  a  login  name.
                  The  program can handle 7-bit characters with even, odd, none or
                  space parity, and 8-bit characters with no parity. The following
                  special  characters  are  recognized: @ and Control-U (kill); #,
                  DEL and back space (erase); carriage return and line  feed  (end
                  of line).  See also --erase-chars and --kill-chars options.
    
           o      Optionally  deduces the baud rate from the CONNECT messages pro-
                  duced by Hayes(tm)-compatible modems.
    
           o      Optionally does not hang up when it is given an  already  opened
                  line (useful for call-back applications).
    
           o      Optionally does not display the contents of the /etc/issue file.
    
           o      Optionally  displays  an  alternative  issue  file  instead   of
                  /etc/issue.
    
           o      Optionally does not ask for a login name.
    
           o      Optionally  invokes  a  non-standard  login  program  instead of
                  /bin/login.
    
           o      Optionally turns on hard-ware flow control
    
           o      Optionally forces the line to be local with no need for  carrier
                  detect.
    
           This  program  does  not use the /etc/gettydefs (System V) or /etc/get-
           tytab (SunOS 4) files.
    
    
    

    ARGUMENTS

           port   A path name relative to the /dev directory. If a "-"  is  speci-
                  fied,  agetty  assumes  that  its standard input is already con-
                  nected to a tty port and that a connection to a remote user  has
                  already been established.
                  overrides  whatever  init(8)  may  have set, and is inherited by
                  login and the shell.
    
    
    

    OPTIONS

           -8     Assume that the tty is 8-bit clean, hence disable parity  detec-
                  tion.
    
           -h     Enable  hardware  (RTS/CTS)  flow  control. It is left up to the
                  application to disable software (XON/XOFF) flow  protocol  where
                  appropriate.
    
           -i     Do  not  display  the  contents  of /etc/issue (or other) before
                  writing the login prompt. Terminals or  communications  hardware
                  may  become  confused  when  receiving lots of text at the wrong
                  baud rate; dial-up scripts may fail if the login prompt is  pre-
                  ceded by too much text.
    
           -E     If -H fakehost option is given then -h fakehost options is added
                  to the the /bin/login command line.
    
           -f issue_file
                  Display the contents of issue_file instead of /etc/issue.   This
                  allows  custom  messages to be displayed on different terminals.
                  The -i option will override this option.
    
           -I initstring
                  Set an initial string to be sent to  the  tty  or  modem  before
                  sending  anything  else. This may be used to initialize a modem.
                  Non printable characters may be sent by writing their octal code
                  preceded  by  a  backslash  (\).  For example to send a linefeed
                  character (ASCII 10, octal 012) write \012.
    
           -l login_program
                  Invoke the specified login_program instead of /bin/login.   This
                  allows the use of a non-standard login program (for example, one
                  that asks for a dial-up password or that uses a different  pass-
                  word file).
    
           -H login_host
                  Write the specified login_host into the utmp file. (Normally, no
                  login host is given, since agetty is used  for  local  hardwired
                  connections and consoles. However, this option can be useful for
                  identifying terminal concentrators and the like.
    
           -L [=mode]
                  Control CLOCAL line flag, the optional argument mode is  'auto',
                  'always'  or  'never'.  If the mode argument is omitted then the
                  default is 'always'.  If the -L option is ommitted at  all  then
                  the default is 'auto'.
    
                  The  mode  'always'  forces  the line to be a local line with no
                  (the first) baud_rate value on the command line.
    
                  Since the -m feature may fail  on  heavily-loaded  systems,  you
                  still should enable BREAK processing by enumerating all expected
                  baud rates on the command line.
    
           -n     Do not prompt the user for a login name. This  can  be  used  in
                  connection with -l option to invoke a non-standard login process
                  such as a BBS system. Note that with the -n option, agetty  gets
                  no  input  from  user who logs in and therefore won't be able to
                  figure out parity, character size, and newline processing of the
                  connection.  It  defaults to space parity, 7 bit characters, and
                  ASCII CR (13) end-of-line character.  Beware  that  the  program
                  that agetty starts (usually /bin/login) is run as root.
    
           -t timeout
                  Terminate  if no user name could be read within timeout seconds.
                  This option should probably not be used with hard-wired lines.
    
           -L     Force the line to be a local  line  with  no  need  for  carrier
                  detect. This can be useful when you have a locally attached ter-
                  minal where the serial line does not set the carrier detect sig-
                  nal.
    
           -U     Turn  on support for detecting an uppercase only terminal.  This
                  setting will detect a login name  containing  only  capitals  as
                  indicating  an uppercase only terminal and turn on some upper to
                  lower case conversions.  Note that this has no support  for  any
                  unicode characters.
    
           -w     Wait  for  the  user or the modem to send a carriage-return or a
                  linefeed character before sending the /etc/issue (or other) file
                  and  the  login  prompt.  Very  useful in connection with the -I
                  option.
    
           --erase-chars string
                  This option specifies additional chars  that  should  be  inter-
                  preted as a backspace (ignore previous char) when user specifies
                  login name. The default is ?#?, specify empty string to  disable
                  the default.
    
           --kill-chars string
                  This  option  specifies  additional  chars that should be inter-
                  preted as a kill (ignore all previous chars) when user specifies
                  login name.  The default is ?@?, specify empty string to disable
                  the default.
    
    
    

    EXAMPLES

           This section shows examples for the process field of an  entry  in  the
           /etc/inittab  file.   You'll have to prepend appropriate values for the
           other fields.  See inittab(5) for more details.
           modem/computer DCD track modem/modem DCD, makes a DTR drop cause a dis-
           connection and turn on auto-answer after 1 ring.)
                /sbin/agetty -w -I 'ATE0Q1&D2&C1S0=1\015' 115200 ttyS1
    
    
    

    ISSUE ESCAPES

           The issue-file (/etc/issue or the file set with the -f option) may con-
           tain certain escape codes to display the system  name,  date  and  time
           etc.  All  escape codes consist of a backslash (\) immediately followed
           by one of the letters explained below.
    
           b      Insert the baudrate of the current line.
    
           d      Insert the current date.
    
           s      Insert the system name, the name of the operating system.
    
           l      Insert the name of the current tty line.
    
           m      Insert the architecture identifier of the machine, eg. i486
    
           n      Insert the nodename of the machine, also known as the  hostname.
    
           o      Insert the NIS domainname of the machine.
    
           O      Insert the DNS domainname of the machine.
    
           r      Insert the release number of the OS, eg. 1.1.9.
    
           t      Insert the current time.
    
           u      Insert the number of current users logged in.
    
           U      Insert  the string "1 user" or "<n> users" where <n> is the num-
                  ber of current users logged in.
    
           v      Insert the version of the OS, eg. the build-date etc.
    
           Example: On my system, the following /etc/issue file:
    
                  This is \n.\o (\s \m \r) \t
    
           displays as
    
                  This is thingol.orcan.dk (Linux i386 1.1.9) 18:29:30
    
    
    

    FILES

           /var/run/utmp, the system status file.
           /etc/issue, printed before the login prompt.
           emits its status message after raising the DCD line.
    
    
    

    DIAGNOSTICS

           Depending on how the program was configured, all diagnostics are  writ-
           ten  to  the  console  device  or  reported via the syslog(3) facility.
           Error messages are produced if the port argument  does  not  specify  a
           terminal  device;  if  there  is  no utmp entry for the current process
           (System V only); and so on.
    
    
    

    AUTHOR(S)

           W.Z. Venema <wietse@wzv.win.tue.nl>
           Eindhoven University of Technology
           Department of Mathematics and Computer Science
           Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
    
           Peter Orbaek <poe@daimi.aau.dk>
           Linux port and more options. Still maintains the code.
    
           Eric Rasmussen <ear@usfirst.org>
           Added -f option to display custom login messages on different terminals.
    
    
    

    AVAILABILITY

           The agetty command is part of the util-linux-ng package and is avail-
           able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
    
                                                                         AGETTY(8)
    
  • MORE RESOURCE


  • Linux

    The Distributions





    Linux

    The Software





    Linux

    The News



  • MARKETING






  • Toll Free

webmaster@linuxguruz.com
Copyright © 1999 - 2016 by LinuxGuruz