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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, 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(1POSIX)