cal(1p) — Linux manual page

PROLOG | NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | STDIN | INPUT FILES | ENVIRONMENT VARIABLES | ASYNCHRONOUS EVENTS | STDOUT | STDERR | OUTPUT FILES | EXTENDED DESCRIPTION | EXIT STATUS | CONSEQUENCES OF ERRORS | APPLICATION USAGE | EXAMPLES | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

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

PROLOG         top

       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         top

       cal — print a calendar

SYNOPSIS         top

       cal [[month] year]

DESCRIPTION         top

       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         top

       None.

OPERANDS         top

       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         top

       Not used.

INPUT FILES         top

       None.

ENVIRONMENT VARIABLES         top

       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         top

       Default.

STDOUT         top

       The standard output shall be used to display the calendar, in an
       unspecified format.

STDERR         top

       The standard error shall be used only for diagnostic messages.

OUTPUT FILES         top

       None.

EXTENDED DESCRIPTION         top

       None.

EXIT STATUS         top

       The following exit values shall be returned:

        0    Successful completion.

       >0    An error occurred.

CONSEQUENCES OF ERRORS         top

       Default.

       The following sections are informative.

APPLICATION USAGE         top

       Note that:

           cal 83

       refers to A.D. 83, not 1983.

EXAMPLES         top

       None.

RATIONALE         top

       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         top

       A future version of this standard may support locale-specific
       recognition of the date of adoption of the Gregorian calendar.

SEE ALSO         top

       The Base Definitions volume of POSIX.1‐2017, Chapter 8,
       Environment Variables

COPYRIGHT         top

       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(1P)