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Linux 2.6 - man page for shutdown (linux section 8)

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 runlevel.

       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 <scott@netsplit.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 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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