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 .