pwd (original) (raw)

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.

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NAME

pwd - return working directory name

SYNOPSIS

pwd **[**-L | -P **]**

DESCRIPTION

The pwd utility shall write to standard output an absolute pathname of the current working directory, which does not contain the filenames dot or dot-dot.

OPTIONS

The pwd utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.

The following options shall be supported by the implementation:

-L

If the PWD environment variable contains an absolute pathname of the current directory that does not contain the filenames dot or dot-dot, pwd shall write this pathname to standard output. Otherwise, the -L option shall behave as the -P option.

-P

The absolute pathname written shall not contain filenames that, in the context of the pathname, refer to files of type symbolic link.

If both -L and -P are specified, the last one shall apply. If neither -L nor -P is specified, the_pwd_ utility shall behave as if -L had been specified.

OPERANDS

None.

STDIN

Not used.

INPUT FILES

None.

ENVIRONMENT VARIABLES

The following environment variables shall affect the execution of pwd:

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_MESSAGES

Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error.

NLSPATH

[XSI] Determine the location of message catalogs for the processing of LC_MESSAGES .

PWD

If the -P option is in effect, this variable shall be set to an absolute pathname of the current working directory that does not contain any components that specify symbolic links, does not contain any components that are dot, and does not contain any components that are dot-dot. If an application sets or unsets the value of PWD , the behavior of pwd is unspecified.

ASYNCHRONOUS EVENTS

Default.

STDOUT

The pwd utility output is an absolute pathname of the current working directory:

"%s\n", <_directory pathname_>

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

If an error is detected, output shall not be written to standard output, a diagnostic message shall be written to standard error, and the exit status is not zero.

The following sections are informative.

APPLICATION USAGE

None.

EXAMPLES

None.

RATIONALE

Some implementations have historically provided pwd as a shell special built-in command.

In most utilities, if an error occurs, partial output may be written to standard output. This does not happen in historical implementations of pwd. Because pwd is frequently used in historical shell scripts without checking the exit status, it is important that the historical behavior is required here; therefore, the CONSEQUENCES OF ERRORS section specifically disallows any partial output being written to standard output.

FUTURE DIRECTIONS

None.

SEE ALSO

cd, the System Interfaces volume of IEEE Std 1003.1-2001, getcwd()

CHANGE HISTORY

First released in Issue 2.

Issue 6

The -P and -L options are added to describe actions relating to symbolic links as specified in the IEEE P1003.2b draft standard.

End of informative text.

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