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.

       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  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 © 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)