CAL(1) User Commands CAL(1)NAMEcal - display a calendar
SYNOPSIScal [options] [[[day] month] year]
DESCRIPTIONcal displays a simple calendar. If no arguments are specified, the
current month is displayed.
Display single month output. (This is the default.)
Display prev/current/next month output.
Display Sunday as the first day of the week.
Display Monday as the first day of the week.
Display Julian dates (days one-based, numbered from January 1).
Display a calendar for the current year.
Display version information and exit.
Display help screen and exit.
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
Two parameters denote the month (1 - 12) and year.
Three parameters denote the day (1-31), month and year, and the day
will be highlighted if the calendar is displayed on a terminal. If no
parameters are specified, the current month's calendar is displayed.
A year starts on Jan 1. The first day of the week is determined by the
The Gregorian Reformation is assumed to have occurred in 1752 on the
3rd of September. By this time, most countries had recognized the ref‐
ormation (although a few did not recognize it until the early 1900's).
Ten days following that date were eliminated by the reformation, so the
calendar for that month is a bit unusual.
A cal command appeared in Version 6 AT&T UNIX.
The cal command is part of the util-linux package and is available from
util-linux June 2011 CAL(1)