acpid --version (return code: 0)
acpid-2.0.26
acpid --help (return code: 1)
Usage: acpid [OPTIONS]
-c, --confdir Set the configuration directory.
-C, --clientmax Set the limit on non-root socket connections.
-d, --debug Increase debugging level (implies -f).
-e, --eventfile Use the specified file for events.
-f, --foreground Run in the foreground.
-l, --logevents Log all event activity.
-g, --socketgroup Set the group on the socket file.
-m, --socketmode Set the permissions on the socket file.
-s, --socketfile Use the specified socket file.
-S, --nosocket Do not listen on a UNIX socket (overrides -s).
-p, --pidfile Use the specified PID file.
-L, --lockfile Use the specified lockfile to stop processing.
-n, --netlink Force netlink/input layer mode. (overrides -e)
-r, --dropaction Define the pseudo-action to drop an event.
-t, --tpmutefix Fixup for ThinkPad mute-repeat behaviour.
-v, --version Print version information.
-h, --help Print this message.