cal(1) — Linux manual pages

Linux manual pages	Section 1

DESCRIPTION

cal displays a simple calendar. If no arguments are specified, the current month is displayed.

OPTIONS

−1, −−one: Display single month output. (This is the default.)
−3, −−three: Display three months spanning the date.
−n , −−months number: Display number of months, starting from the month containing the date.
−S, −−span: Display months spanning the date.
−s, −−sunday: Display Sunday as the first day of the week.
−m, −−monday: Display Monday as the first day of the week.
−j, −−julian: Display Julian dates (days one-based, numbered from January 1).
−y, −−year: Display a calendar for the whole year.
−Y, −−twelve: Display a calendar for the next twelve months.
−w, −−week[=number]: Display week numbers in the calendar (US or ISO-8601).
−−color[=when]: Colorize the output. The optional argument when can be auto, never or always. If the when argument is omitted, it defaults to auto. The colors can be disabled; for the current built-in default see the −−help output. See also the COLORS section.
−V, −−version: Display version information and exit.
−h, −−help: Display help text and exit.

PARAMETERS

A single parameter specifies the year 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.

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 January 1. The first day of the week is determined by the locale.

The week numbering depends on the choice of the first day of the week. If Sunday (the default) is used for the first day of the week, then the customary North American numbering will be used, i.e. the first Sunday of the year starts the first week. If Monday is selected, then the ISO-8601 standard week numbering is used, where the first Thursday of the year is in week number 1.

COLORS

Implicit coloring can be disabled as follows:

  touch /etc/terminal-colors.d/cal.disable

See terminal-colors.d(5) for more details about colorization configuration.

BUGS

The cal program uses the 3rd of September 1752 as the date of the Gregorian calendar reformation -- that is when it happened in Great Britain and its colonies (including what is now the USA). Starting at that date, eleven days were eliminated by this reformation, so the calendar for that month is rather unusual. The actual historical dates at which the calendar reform happened in all the different countries (locales) are ignored.

Alternative calendars, such as the Umm al-Qura, the Solar Hijri, the Ge'ez, or the lunisolar Hindu, are not supported.

HISTORY

A cal command appeared in Version 6 AT&T UNIX.

AVAILABILITY

The cal command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

  Copyright (c) 1989, 1990, 1993
The Regents of the University of California.  All rights reserved.

This code is derived from software contributed to Berkeley by
Kim Letkeman.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by the University of
California, Berkeley and its contributors.
4. Neither the name of the University nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.

    (#)cal.1 8.1 (Berkeley) 6/6/93

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