cal

cal [options] [[month] year]

Print a 12-month calendar (beginning with January) for the given year, or a one-month calendar of the given month and year. month ranges from 1 to 12. year ranges from 1 to 9999. With no arguments, print a calendar for the current month.

Options
-j	Display Julian dates (days numbered 1 to 365, starting from January 1).
-m	Display Monday as the first day of the week.
-y	Display entire year.

Examples
cal 12 2006 cal 2006 > year_file