shutdown(8)                                                                                                          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  formats  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.

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

       This is performed by emitting the runlevel(7) event, which includes the new runlevel in the RUNLEVEL environment variable
       as well as the previous 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 <scottATnetsplit.com>

REPORTING BUGS
       Report bugs at <https://launchpad.net/upstart/+bugs>

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 FIT-
       NESS FOR A PARTICULAR PURPOSE.

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



Upstart                                                    2009-07-09                                                shutdown(8)