A public domain reimplementation of the Unix cal program
Description:
When invoked without arguments calend prints a calendar for the preceding, current, and next months of the current year. If a month is given it prints the three months centered on the requested month. If a year is given, it prints a calendar for the entire year. Greg approximates the functionality of cal except that the information is provided in a way that is appropriate for use in other programs rather than visual display.
