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I’ve just been using a wristband made out of cheap headphones plugged into a 3.5mm jack, acpi event triggers the shutdown.

How does that work? Can you use udev to call a script on an acpi event? Is it cross-platform?

Would love to see a write-up with more info on how to do this :)

acpid is probably the easiest way to accomplish this https://wiki.archlinux.org/title/acpid