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CAL(1P)			   POSIX Programmer's Manual		       CAL(1P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       cal — print a calendar

SYNOPSIS
       cal [[month] year]

DESCRIPTION
       The cal utility shall write a calendar to  standard  output  using  the
       Julian  calendar	 for dates from January 1, 1 through September 2, 1752
       and the Gregorian calendar for dates from September  14,	 1752  through
       December	 31, 9999 as though the Gregorian calendar had been adopted on
       September 14, 1752.

       If no operands are given, cal shall produce a  one-month	 calendar  for
       the  current  month  in	the  current year. If only the year operand is
       given, cal shall produce a calendar for all twelve months in the	 given
       calendar	 year.	If  both  month and year operands are given, cal shall
       produce a one-month calendar for the given month in the given year.

OPTIONS
       None.

OPERANDS
       The following operands shall be supported:

       month	 Specify the month to be displayed, represented as  a  decimal
		 integer from 1 (January) to 12 (December).

       year	 Specify  the year for which the calendar is displayed, repre‐
		 sented as a decimal integer from 1 to 9999.

STDIN
       Not used.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of cal:

       LANG	 Provide a default value for  the  internationalization	 vari‐
		 ables	that are unset or null. (See the Base Definitions vol‐
		 ume of POSIX.1‐2008, Section 8.2, Internationalization	 Vari‐
		 ables	for  the  precedence of internationalization variables
		 used to determine the values of locale categories.)

       LC_ALL	 If set to a non-empty string value, override  the  values  of
		 all the other internationalization variables.

       LC_CTYPE	 Determine  the	 locale for the interpretation of sequences of
		 bytes of text data as characters (for example, single-byte as
		 opposed to multi-byte characters in arguments).

       LC_MESSAGES
		 Determine the locale that should be used to affect the format
		 and contents  of  diagnostic  messages	 written  to  standard
		 error, and informative messages written to standard output.

       LC_TIME	 Determine the format and contents of the calendar.

       NLSPATH	 Determine the location of message catalogs for the processing
		 of LC_MESSAGES.

       TZ	 Determine the timezone used to calculate  the	value  of  the
		 current month.

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       The  standard  output  shall  be	 used  to  display the calendar, in an
       unspecified format.

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

	0    Successful completion.

       >0    An error occurred.

CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       Note that:

	   cal 83

       refers to A.D. 83, not 1983.

EXAMPLES
       None.

RATIONALE
       Earlier versions of this standard incorrectly required  that  the  com‐
       mand:

	   cal 2000

       write  a	 one-month  calendar for the current calendar month (no matter
       what the current year is) in the year 2000 to standard output. This did
       not  match  historic  practice in any known version of the cal utility.
       The description has been updated to match historic practice.  When only
       the  year  operand is given, cal writes a twelve-month calendar for the
       specified year.

FUTURE DIRECTIONS
       A future version of this standard may support locale-specific  recogni‐
       tion of the date of adoption of the Gregorian calendar.

SEE ALSO
       The  Base  Definitions  volume  of POSIX.1‐2008, Chapter 8, Environment
       Variables

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal and Electronics Engineers,  Inc  and	 The  Open  Group.   (This  is
       POSIX.1-2008  with  the	2013  Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.unix.org/online.html .

       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			       CAL(1P)
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