on_ac_power checks whether the system is running on AC power (i.e.,
mains power) as opposed to battery power.
0 (true) System is on mains power
1 (false) System is not on mains power
255 (false) Power status could not be determined
/proc/apm APM status information file
/proc/acpi ACPI status information directory
This manual page was written by Steve Dodd <firstname.lastname@example.org>
and was updated by Thomas Hood.
9 March 2002 ON_AC_POWER(1)
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