this post was submitted on 01 Oct 2024
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Systemd timer to poll upower when running on battery power, when battery is at 20%, use either system beep or set system volume and play a sound?
I'm sure is possible, but I'm actually asking for the exact steps/script, not the general idea. :)
Remove the loop and sleep from the script you created so it just runs and exits.
Then create a file at
/etc/systemd/system/battery-alarm.service
with the following:Then create a file at
/etc/systemd/system/battery-alarm.timer
with the following:Then
sudo systemctl enable --now helloworld.timer
to start and enable the timer on boot.This will be a little more robust then your current script. It works without the user needing to log in. And there is nothing to get killed so will always trigger. The current script will just silently stop working if it ever gets killed or crashes.
thanks, I'll try that!
A cron job would not be a bad idea.