Linux Command Library
commands
Commands
basic
Basic
tips
Tips

shutdown

Halt, power-off or reboot the machine

- Power off (halt) immediately:
shutdown -h now

- Reboot immediately:
shutdown -r now

- Reboot in 5 minutes:
shutdown -r +[5] &

- Shutdown at 1:00 pm (Uses 24h clock):
shutdown -h 13:00

- Cancel a pending shutdown/reboot operation:
shutdown -c

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-off the machine (the default).

-r, --reboot

Reboot the machine.

-h

Equivalent to --poweroff, unless --halt is specified.

-k

Do not halt, power-off, reboot, just write wall message.

--no-wall

Do not send wall message before halt, power-off, reboot.

-c

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 "now".

On success, 0 is returned, a non-zero failure code otherwise.

systemd(1), systemctl(1), halt(8), wall(1)

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