The Open Group Base Specifications Issue 7
IEEE Std 1003.1, 2013 Edition
Copyright © 2001-2013 The IEEE and The Open Group

#### 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 XBD 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, if the PWD environment variable contains a pathname of the current directory that is longer than {PATH_MAX} bytes including the terminating null, and the pathname does not contain any components that are dot or dot-dot, it is unspecified whether pwd writes this pathname to standard output or behaves as if the -P option had been specified. Otherwise, the -L option shall behave as the -P option.
> -P
>   The pathname written to standard output shall not contain any components that refer to files of type symbolic link. If there are multiple pathnames that the pwd utility could write to standard output, one beginning with a single <slash> character and one or more beginning with two <slash> characters, then it shall write the pathname beginning with a single <slash> character. The pathname shall not contain any unnecessary <slash> characters after the leading one or two <slash> characters.

> 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 XBD Internationalization Variables 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
>   An absolute pathname of the current working directory. 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

> If the pathname obtained from pwd is longer than {PATH_MAX} bytes, it could produce an error if passed to cd. Therefore, in order to return to that directory it may be necessary to break the pathname into sections shorter than {PATH_MAX} and call cd on each section in turn (the first section being an absolute pathname and subsequent sections being relative pathnames).

#### 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.

> An earlier version of this standard stated that the PWD environment variable was affected when the -P option was in effect. This was incorrect; conforming implementations do not do this.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> cd

> XBD Environment Variables, Utility Syntax Guidelines

> XSH 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.

#### Issue 7

> Austin Group Interpretation 1003.1-2001 #097 is applied.

> SD5-XCU-ERN-97 is applied, updating the SYNOPSIS.

> Changes to the pwd utility and PWD environment variable have been made to match the changes to the getcwd() function made for Austin Group Interpretation 1003.1-2001 #140.

End of informative text.

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