showkey --version (return code: 0)
showkey from kbd 1.15.5
showkey --help (return code: 1)
showkey version 1.15.5
usage: showkey [options...]
valid options are:
-h --help display this help text
-a --ascii display the decimal/octal/hex values of the keys
-s --scancodes display only the raw scan-codes
-k --keycodes display only the interpreted keycodes (default)