CAL(1) BSD Reference Manual CAL(1)
cal - displays a calendar
cal [-jy] [[month] year]
cal displays a simple calendar. If arguments are not specified, the current month is displayed. The options are as follows: -j Display Julian dates (days one-based, numbered from January 1). -y Display a calendar for the current year. A single parameter specifies the year (1 - 9999) to be displayed; note the year must be fully specified: "cal 89" will not display a calendar for 1989. Two parameters denote the month (1 - 12) and year. If no param- eters are specified, the current month's calendar is displayed. A year starts on January 1st. The Gregorian Reformation is assumed to have occurred in 1752 after the 2nd of September. By this time, most countries had recognized the refor- mation (although a few did not recognize it until the early 1900's). Eleven days following that date were eliminated by the reformation, so the calendar for that month is a bit unusual.
The cal command offers a superset of IEEE Std 1003.2 ("POSIX.2") func- tionality.
A cal command appeared in Version 6 AT&T UNIX. MirOS BSD #10-current April 28, 1995 1
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