First parameter, NAME, should be all caps
Second parameter, SECTION, should be 1-8, maybe w/ subsection
other parameters are allowed: see man(7), man(1)
(The comments found at the beginning of the groff file "man1/on_ac_power.1".)
on_ac_power - test whether computer is running 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 <email@example.com>
and was updated by Thomas Hood.