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



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

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.1-2017, 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.1-2017, Chapter _8, Environment
       Variables

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  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.opengroup.org/unix/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                  2017                               CAL(1)
