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shutdown − Halt, power off or reboot the machine
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shutdown [OPTIONS...] [TIME] [WALL...] |
shutdown may be used to halt, power off, or reboot the machine.
The first argument may be a time string (which is usually "now"). Optionally, this may be followed by a wall message to be sent to all logged−in users before going down.
The time string may either be in the format "hh:mm" for hour/minutes specifying the time to execute the shutdown at, specified in 24h clock format. Alternatively it may be in the syntax "+m" referring to the specified number of minutes m from now. "now" is an alias for "+0", i.e. for triggering an immediate shutdown. If no time argument is specified, "+1" is implied.
Note that to specify a wall message you must specify a time argument, too.
If the time argument is used, 5 minutes before the system goes down the /run/nologin file is created to ensure that further logins shall not be allowed.
The following options are understood:
−−help
Print a short help text and exit.
−H, −−halt
Halt the machine.
−P, −−poweroff
Power the machine off (the default).
−r, −−reboot
Reboot the machine.
−h
The same as −−poweroff, but does not override the action to take if it is "halt". E.g. shutdown −−reboot −h means "poweroff", but shutdown −−halt −h means "halt".
−k
Do not halt, power off, or reboot, but just write the wall message.
−−no−wall
Do not send wall message before halt, power off, or reboot.
−c
Cancel a pending shutdown. This may be used to cancel the effect of an invocation of shutdown with a time argument that is not "+0" or "now".
−−show
Show a pending shutdown action and time if there is any.
On success, 0 is returned, a non−zero failure code otherwise.
The
shutdown command in previous init systems (including
sysvinit) defaulted to single−user mode instead of
powering off the machine. To change into single−user
mode, use systemctl rescue instead.
systemd(1), systemctl(1), halt(8), wall(1)