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File: //usr/share/doc/acpid/README.Debian
acpid for Debian
================

The acpid daemon can handle user defined events. Place event files under
/etc/acpi/events.

If an event occurs, acpid recurses through the event files in order to
see if the regex defined after "event" matches. If they do, action is
executed.

An example with /etc/acpi/events/powerbtn to handle presses on the power
button.

new style:
    event=button/power .*
    action=/etc/acpi/powerbtn.sh

old style:
    event=button power.*
    action=/etc/acpi/powerbtn.sh

to handle both styles:
    event=button[ /]power
    action=/etc/acpi/powerbtn.sh

Your script will get the complete event string (as reported by
/proc/acpid/events), if you use %e as a parameter of your script.
You may want to split this by calling set $*. $1 then holds the
event group, $2 takes the event and $3 and $4 take the values as
reported by the kernel.

When using acpid with modules, you can use /etc/default/acpid in order
to specify Linux kernel modules to be loaded at startup.