Display a calendar

SYNTAX
cal [-mjy] [[month] year]

options:

-m Display monday as the first day of the week.

-j Display julian dates (days one-based, numbered from January 1).

-y Display a calendar for the current year.

A single parameter specifies the 4 digit year (1 – 9999) to be displayed.

Two parameters denote the Month (1 – 12) and Year (1 – 9999).

If arguments are not specified, the current month is displayed.

A year starts on 01 Jan.