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I was trying to create a simple(ish) way to detect whether my laptop lid was closed and activate i3lock when it is. I know that this can be done through acpid or other methods, but I wanted to learn more about systemd timers anyway, so I went that way. It turns out that systemd has special units for timers, and one of them is for sleep, but I was unable to find anything online telling me how to do this, even on the usually amazing arch wiki. Does anyone know how to set up a service/timer to activate on these special units?

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  • It's a target, so you would use it in, for example, a Requires= or After= declaration in your service file.
    – jasonwryan
    Commented Jan 2, 2018 at 4:56

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sleep.target is a target, so you name it in a WantedBy setting in your service unit file, and then enable the service.

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