evtest --version (return code: 0)
evtest 1.33
evtest --help (return code: 1)
evtest: unrecognized option '--help'
USAGE:
Capture mode:
evtest [--grab] /dev/input/eventX
--grab grab the device for exclusive access
Query mode: (check exit code)
evtest --query /dev/input/eventX <type> <value>
<type> is one of: EV_KEY, EV_SW, EV_LED, EV_SND
<value> can either be a numerical value, or the textual name of the
key/switch/LED/sound being queried (e.g. SW_DOCK).