# SHUTDOWN - man(8) - [phpMan]

[_SHUTDOWN_(8)](https://www.chedong.com/phpMan.php/man/SHUTDOWN/8/markdown)                                   shutdown                                   [_SHUTDOWN_(8)](https://www.chedong.com/phpMan.php/man/SHUTDOWN/8/markdown)

## NAME
       shutdown - Halt, power off or reboot the machine

## SYNOPSIS


       **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
           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.

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

## COMPATIBILITY
       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.

## SEE ALSO
       [**systemd**(1)](https://www.chedong.com/phpMan.php/man/systemd/1/markdown), [**systemctl**(1)](https://www.chedong.com/phpMan.php/man/systemctl/1/markdown), [**halt**(8)](https://www.chedong.com/phpMan.php/man/halt/8/markdown), [**wall**(1)](https://www.chedong.com/phpMan.php/man/wall/1/markdown)

systemd 255                                                                              [_SHUTDOWN_(8)](https://www.chedong.com/phpMan.php/man/SHUTDOWN/8/markdown)