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Ederico
Asked: 2011-11-14 11:04:30 +0800 CST

How can I hibernate/suspend from the command line and do so at a specific time

  • 772

I managed to find out how to suspend/hibernate the system from the command line by reading How can I suspend/hibernate from command line?.

However, I would like to know how to use the command line to suspend/hibernate at a given time, in absolute (example, 11PM) or relative (example, in 30 minutes) terms.

I already know how to do this with shutdown, but I'm note sure if the command is similar.

11.10

3 Answers

  1. Best Answer

    You can use the at command to schedule any action, including running the commands detailed in that question.

    For example, if you want to hibernate in 30 minutes:

    echo 'pmi action hibernate' | at now + 30 min

    Or if you want to suspend at 11:00 pm:

    echo 'pmi action suspend' | at 11pm

    If you need to run a command as root, run at with sudo rather than the command itself with sudo (since sudo should only be run interactively, unless you've configured it not to ask for your password). For example, the equivalents of the above commands using pm-hibernate and pm-suspend are:

    echo pm-hibernate | sudo at now + 30 min

    echo pm-suspend | sudo at 11pm

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  2. For relative specification (e.g. "after 30 minutes") you can simply use sleep command to make suspending/hibernating command wait.

    Examples:

    Wait 30 minutes, then suspend:

    sudo sleep 30m; sudo pm-suspend

    Wait 1 hour, then hibernate:

    sudo sleep 1h; sudo pm-hibernate
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  3. For specific times repeated - like shutting down computers are a specific time each day. use cron.

    crontab -e

    add the following:

    15 14 1 * * pmi action suspend

    If you want to customize it.

    * * * * * command to be executed
- - - - -
| | | | |
| | | | ----- Day of week (0 - 7) (Sunday=0 or 7)
| | | ------- Month (1 - 12)
| | --------- Day of month (1 - 31)
| ----------- Hour (0 - 23)
------------- Minute (0 - 59)

    For a one time job us the at command

    For example, if you want to hibernate in 30 minutes:

    echo 'pmi action hibernate' | at now + 30 min

    Or if you want to suspend at 11:00 pm:

    echo 'pmi action suspend' | at 11pm
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