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 correspond-
       ing 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, represented 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 variables that are unset or  null.  (See	the  Base  Definitions	volume	of
		 POSIX.1-2008,	Section 8.2, Internationalization Variables 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 command:

	   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 recognition 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 Technol-
       ogy  --	Portable  Operating  System  Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical 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 Stan-
       dard 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.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013								   CAL(1P)