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Accepted
Thabby07
Asked: 2014-11-26 13:39:50 +0800 CST

Shutdown my system in 30 minutes with telinit

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If I want to shutdown my system in 30 minutes with telinit, how could I do it? I know that with shutdown is easier but just for knowing it.

runlevel

3 Answers

  1. Best Answer

    Using at:

    at now + 30 minutes <<<'telinit 0'

    Or use sleep 30m; telinit 0.

    telinit itself cannot do this. You will have to use other tools in combination. at and sleep both allow you to cancel the operation (with atrm for at and CtrlC for the other).

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  2. # telinit 0

    Runlevel 0 is halt mode. Telling init to enter runlevel 0 will cause all processes to be killed off, the filesystems unmounted, and the machine to be halted. This is a perfectly acceptable way to bring down the system. On many laptops and modern desktop computers, this will also cause the machine to be turned off. Source

    Extra in case someone wonders about rebooting:

    # telinit 6

    Runlevel 6 is reboot mode. All processes will be killed off, the filesystems will be unmounted, and the machine will be rebooted. This is a perfectly acceptable method of rebooting the system. Source

    To execute something in the future we have the "at" command. That would be:

    # at now+30 minutes <<<'telinit 0'

    or sleep:

    # sleep 1800 && telinit 0

    (1800 seconds)

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  3. As a suggestion, not addressing to your question directly. Even at command is not installed by default and sleep with telinit is a great chioce: If you want to try another tool other than telinit, you could try reboot with at:

    echo reboot | at now +30 m
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