SIMPLE SOLUTIONS

SHUTDOWN - reference manual online

Bring the system down.

Chapter
2009-07-09 
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 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 <@netsplit.com>


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


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


Upstart                                     2009-07-09                                shutdown(8)
This manual Reference Other manuals
shutdown(8) referred by boot(7) | control-alt-delete(7) | halt(5) | halt(8) | initctl(8) | kexec(8) | last(1) | molly-guard(8) | nologin(5) | pidof(8) | pxe-kexec(8) | reboot(8) | runlevel(7) | runlevel(8) | sudo(8) | systemd.directives(7) | systemd.index(7) | telinit(8) | upstart(8) | upstart-events(7)
refer to reboot(8) | runlevel(7) | telinit(8)