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Linux / Unix shutdown command

Quick links

About shutdown
Syntax
Examples
Related commands
Linux / Unix main page

About shutdown

Turn off the computer immediately or at a specified time.

Syntax

shutdown [-a][-t sec][-krhnfFc][time][warning-message]

-aUse /etc/shutdown.allow.
-t secTell init to wait sec seconds between sending processes the warning and the kill signal, before changing to another runlevel.
-kDon't really shutdown; only send the warning messages to everybody.
-rReboot after shutdown.
-hHalt after shutdown.
-nDon'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.
-fSkip fsck on reboot.
-FForce fsck on reboot.
-cCancel 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.
timeWhen to shutdown.
warning-messageMessage to send to all users.

Examples

shutdown 8:00
Shutdown the computer at 8-oclock

Related commands

halt
poweroff
reboot

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