The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

#### NAME

> cal - print a calendar

#### SYNOPSIS

> ``[XSI] 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.

#### CHANGE HISTORY

> First released in Issue 2.

#### Issue 6

> The DESCRIPTION is updated to allow for traditional behavior for years before the adoption of the Gregorian calendar.

End of informative text.

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