acpi_listen --version (return code: 0)
acpid-2.0.26
acpi_listen --help (return code: 0)
Usage: acpi_listen [OPTIONS]
-c, --count Set the maximum number of events.
-s, --socketfile Use the specified socket file.
-t, --time Listen for the specified time (in seconds).
-v, --version Print version information.
-h, --help Print this message.