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)

Upstart                                            2009-07-09                                        shutdown(8)