Cal displays a simple calendar.  If NO arguments are specified,
the current month is displayed.

Cal [1583 - 3999] - Displays a calendar for any year 1583 to 3999
Cal [1 - 12] [1583 - 3999] - Displays a specific month's calendar
Cal [/? | -? | -h | help | --help] - Displays this HELP information
Cal [/v | -v | version | --version] - Displays VERSION information