cal -V (return code: 64)
cal: invalid option -- '-'
Usage: cal [general options] [-hjy] [[month] year]
cal [general options] [-hj] [-m month] [year]
ncal [general options] [-bhJjpwySM] [-s country_code] [[month] year]
ncal [general options] [-bhJeoSM] [year]
General options: [-NC31] [-A months] [-B months]
For debug the highlighting: [-H yyyy-mm-dd] [-d yyyy-mm]
cal --help (return code: 64)
cal: invalid option -- '-'
Usage: cal [general options] [-hjy] [[month] year]
cal [general options] [-hj] [-m month] [year]
ncal [general options] [-bhJjpwySM] [-s country_code] [[month] year]
ncal [general options] [-bhJeoSM] [year]
General options: [-NC31] [-A months] [-B months]
For debug the highlighting: [-H yyyy-mm-dd] [-d yyyy-mm]