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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)
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.
cal — print a calendar
cal [[month] year]
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.
None.
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.
Not used.
None.
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.
Default.
The standard output shall be used to display the calendar, in an
unspecified format.
The standard error shall be used only for diagnostic messages.
None.
None.
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
Default.
The following sections are informative.
Note that:
cal 83
refers to A.D. 83, not 1983.
None.
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.
A future version of this standard may support locale-specific
recognition of the date of adoption of the Gregorian calendar.
The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
Variables
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 .
IEEE/The Open Group 2013 CAL(1P)