shutdown - Man Page

• Power off ([h]alt) immediately: shutdown -h now
• [r]eboot immediately: shutdown -r now
• [r]eboot in 5 minutes: shutdown -r +5 &
• Shutdown at 1:00 pm (Uses 24[h] clock): shutdown -h 13:00
• [c]ancel a pending shutdown/reboot operation: shutdown -c

tldr.sh

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.

Added in version 250.

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)

apccontrol(8), kexec(8), last(1), login(1), nologin(5), openrc(8), poweroff(8), reboot(2), sudo(8), systemd.directives(7), systemd.index(7), wall(1).