Ubuntu – How to hibernate/suspend from the command line and do so at a specific time

11.10command linehibernatesuspend

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.

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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