shutdown

systemd
shutdown 8
shutdown Halt, power-off or reboot the machine
`shutdown` OPTIONS TIME WALL

## Description

`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.

## Options

The following options are understood:

`--help`
`-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 to cancel the effect of an invocation of `shutdown` with a time argument that is not `+0` or `now`.

## Exit status

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

## See Also

systemd 1, systemctl 1, halt 8, wall 1