With no arguments, prints a calendar
for the current month. Otherwise, prints either a 12-month calendar (beginning with January) for the given
year or a one-month calendar of the given
month ranges from 1 to 12;
year ranges from 1 to 9999.
Print all days with Julian dates, which number from 1 (for January 1) to the last day of the year.
Print the entire calendar for the current year.
cal -j 12 2003$
cal 2003 >