apm_available checks whether the APM ("Advanced Power Management") sub-
system is available, as evidenced by the presence of the /proc/apm
0 (true) APM subsystem is available
1 (false) APM subsystem is not available
2 usage error (arguments supplied)
/proc/apm APM status information file
This manual page was written by Thomas Hood <firstname.lastname@example.org>.
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