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shutdown(8)                 System Manager's Manual                shutdown(8)



NAME
       shutdown - bring the system down

SYNOPSIS
       shutdown [OPTION]...  TIME [MESSAGE]

DESCRIPTION
       shutdown arranges for the system to be brought down in a safe way.  All
       logged-in users are notified that the system is going down and,  within
       the last five minutes of TIME, new logins are prevented.

       TIME  may  have  different  formats, the most common is simply the word
       'now' which will bring the system down immediately.  Other  valid  for-
       mats  are  +m,  where m is the number of minutes to wait until shutting
       down and hh:mm which specifies the time on the 24hr clock.

       If no option is specified, the default action is to  bring  the  system
       down into single-user mode.

       Once  TIME  has elapsed, shutdown sends a request to the init(8) daemon
       to bring the system down into the appropriate runlevel.

       This is performed by emitting the runlevel(7) event, which includes the
       new runlevel in the RUNLEVEL environment variable as well as the previ-
       ous runlevel (obtained from the environment or from  /var/run/utmp)  in
       the  PREVLEVEL  variable.  An additional INIT_HALT variable may be set,
       this will contain the value HALT when bringing the system down for halt
       and POWEROFF when bringing the system down for power off.

OPTIONS
       -r     Requests  that  the system be rebooted after it has been brought
              down.

       -h     Requests that the system be either halted or powered  off  after
              it has been brought down, with the choice as to which left up to
              the system.

       -H     Requests that the system be halted after  it  has  been  brought
              down.

       -P     Requests  that  the  system  be  powered  off  after it has been
              brought down.

       -c     Cancels a running shutdown.  TIME is  not  specified  with  this
              option, the first argument is MESSAGE.

       -k     Only  send  out  the warning messages and disable logins, do not
              actually bring the system down.

ENVIRONMENT
       RUNLEVEL
              shutdown will read the current runlevel  from  this  environment
              variable if set in preference to reading from /var/run/utmp

FILES
       /var/run/utmp
              Where  the  current  runlevel  will be read from; this file will
              also be updated with the new runlevel.

       /var/log/wtmp
              A new runlevel record will be appended to this file for the  new
              runlevel.

NOTES
       The  Upstart  init(8)  daemon  does not keep track of runlevels itself,
       instead they are implemented entirely by its userspace tools.

       See runlevel(7) for more details.

AUTHOR
       Written by Scott James Remnant 

REPORTING BUGS
       Report bugs at 

COPYRIGHT
       Copyright (C) 2009 Canonical Ltd.
       This is free software; see the source for copying conditions.  There is
       NO  warranty;  not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.

SEE ALSO
       runlevel(7) init(8) telinit(8) reboot(8)



Upstart                           2009-07-09                       shutdown(8)



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