Linux and Unix shutdown command
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About shutdown
Syntax
Examples
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Linux and Unix main page
Turn off the computer immediately or at a specified time.
shutdown [-a][-t sec][-krhnfFc][time][warning-message]
| -a | Use /etc/shutdown.allow. |
| -t sec | Tell init to wait sec seconds between sending processes the warning and the kill signal, before changing to another runlevel. |
| -k | Don't really shutdown; only send the warning messages to everybody. |
| -r | Reboot after shutdown. |
| -h | Halt after shutdown. |
| -n | Don't call init to do the shutdown but do it ourselves. The use of this option is discouraged, and its results are not always what you'd expect. |
| -f | Skip fsck on reboot. |
| -F | Force fsck on reboot. |
| -c | Cancel an already running shutdown. With this option it is of course not possible to give the time argument, but you can enter an explanatory message on the command line that will be sent to all users. |
| time | When to shutdown. |
| warning-message | Message to send to all users. |
shutdown 8:00
Shutdown the computer at 8-oclock