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.

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). The default shall be the current month.

year

Specify the year for which the calendar is displayed, represented as a decimal integer from 1 to 9999. The default shall be the current year.

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 IEEE Std 1003.1-2001, 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¶

None.

FUTURE DIRECTIONS¶

A future version of IEEE Std 1003.1-2001 may support locale-specific recognition of the date of adoption of the Gregorian calendar.

SEE ALSO¶

None.

COPYRIGHT¶

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .