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.1‐2008, 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 Technology -- 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 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.kernel.org/doc/man-pages/reporting_bugs.html .