SHUTDOWN(8) shutdown SHUTDOWN(8)
shutdown - Halt, power-off or reboot the machine
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,
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
The following options are understood:
Print a short help text and exit.
Halt the machine.
Power-off the machine (the default).
Reboot the machine.
Equivalent to --poweroff, unless --halt is specified.
Do not halt, power-off, reboot, just write wall message.
Do not send wall message before halt, power-off, reboot.
Cancel a pending shutdown. This may be used cancel the effect of an
invocation of shutdown with a time argument that is not "+0" or
On success, 0 is returned, a non-zero failure code otherwise.
systemd(1), systemctl(1), halt(8), wall(1)
systemd 237 SHUTDOWN(8)
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