244 lines
7.4 KiB
HTML
244 lines
7.4 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>pwd</title>
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</head>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="pwd"></a> <a name="tag_04_105"></a><!-- pwd -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_04_105_01"></a>NAME</h4>
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<blockquote>pwd - return working directory name</blockquote>
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<h4><a name="tag_04_105_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>pwd</tt> <b>[</b><tt>-L | -P</tt> <b>]</b></code></p>
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</blockquote>
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<h4><a name="tag_04_105_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pwd</i> utility shall write to standard output an absolute pathname of the current working directory, which does not
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contain the filenames dot or dot-dot.</p>
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</blockquote>
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<h4><a name="tag_04_105_04"></a>OPTIONS</h4>
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<blockquote>
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<p>The <i>pwd</i> utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/xbd_chap12.html#tag_12_02">Section 12.2, Utility Syntax Guidelines</a>.</p>
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<p>The following options shall be supported by the implementation:</p>
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<dl compact>
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<dt><b>-L</b></dt>
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<dd>If the <i>PWD</i> environment variable contains an absolute pathname of the current directory that does not contain the
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filenames dot or dot-dot, <i>pwd</i> shall write this pathname to standard output. Otherwise, the <b>-L</b> option shall behave as
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the <b>-P</b> option.</dd>
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<dt><b>-P</b></dt>
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<dd>The absolute pathname written shall not contain filenames that, in the context of the pathname, refer to files of type symbolic
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link.</dd>
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</dl>
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<p>If both <b>-L</b> and <b>-P</b> are specified, the last one shall apply. If neither <b>-L</b> nor <b>-P</b> is specified, the
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<i>pwd</i> utility shall behave as if <b>-L</b> had been specified.</p>
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</blockquote>
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<h4><a name="tag_04_105_05"></a>OPERANDS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_105_06"></a>STDIN</h4>
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<blockquote>
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<p>Not used.</p>
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</blockquote>
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<h4><a name="tag_04_105_07"></a>INPUT FILES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_105_08"></a>ENVIRONMENT VARIABLES</h4>
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<blockquote>
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<p>The following environment variables shall affect the execution of <i>pwd</i>:</p>
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<dl compact>
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<dt><i>LANG</i></dt>
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<dd>Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap08.html#tag_08_02">Section 8.2, Internationalization Variables</a> for
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the precedence of internationalization variables used to determine the values of locale categories.)</dd>
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<dt><i>LC_ALL</i></dt>
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<dd>If set to a non-empty string value, override the values of all the other internationalization variables.</dd>
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<dt><i>LC_MESSAGES</i></dt>
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<dd>Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard
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error.</dd>
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<dt><i>NLSPATH</i></dt>
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<dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i> <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></dd>
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<dt><i>PWD</i></dt>
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<dd>If the <b>-P</b> option is in effect, this variable shall be set to an absolute pathname of the current working directory that
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does not contain any components that specify symbolic links, does not contain any components that are dot, and does not contain any
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components that are dot-dot. If an application sets or unsets the value of <i>PWD ,</i> the behavior of <i>pwd</i> is
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unspecified.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_105_09"></a>ASYNCHRONOUS EVENTS</h4>
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<blockquote>
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<p>Default.</p>
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</blockquote>
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<h4><a name="tag_04_105_10"></a>STDOUT</h4>
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<blockquote>
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<p>The <i>pwd</i> utility output is an absolute pathname of the current working directory:</p>
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<pre>
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<tt>"%s\n", <</tt><i>directory pathname</i><tt>>
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_04_105_11"></a>STDERR</h4>
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<blockquote>
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<p>The standard error shall be used only for diagnostic messages.</p>
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</blockquote>
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<h4><a name="tag_04_105_12"></a>OUTPUT FILES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_105_13"></a>EXTENDED DESCRIPTION</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_105_14"></a>EXIT STATUS</h4>
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<blockquote>
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<p>The following exit values shall be returned:</p>
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<dl compact>
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<dt> 0</dt>
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<dd>Successful completion.</dd>
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<dt>>0</dt>
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<dd>An error occurred.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_105_15"></a>CONSEQUENCES OF ERRORS</h4>
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<blockquote>
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<p>If an error is detected, output shall not be written to standard output, a diagnostic message shall be written to standard
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error, and the exit status is not zero.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_04_105_16"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_105_17"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_105_18"></a>RATIONALE</h4>
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<blockquote>
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<p>Some implementations have historically provided <i>pwd</i> as a shell special built-in command.</p>
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<p>In most utilities, if an error occurs, partial output may be written to standard output. This does not happen in historical
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implementations of <i>pwd</i>. Because <i>pwd</i> is frequently used in historical shell scripts without checking the exit status,
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it is important that the historical behavior is required here; therefore, the CONSEQUENCES OF ERRORS section specifically disallows
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any partial output being written to standard output.</p>
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</blockquote>
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<h4><a name="tag_04_105_19"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_105_20"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="cd.html"><i>cd</i></a> , the System Interfaces volume of IEEE Std 1003.1-2001, <a href=
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"../functions/getcwd.html"><i>getcwd</i>()</a></p>
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</blockquote>
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<h4><a name="tag_04_105_21"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 2.</p>
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</blockquote>
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<h4><a name="tag_04_105_22"></a>Issue 6</h4>
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<blockquote>
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<p>The <b>-P</b> and <b>-L</b> options are added to describe actions relating to symbolic links as specified in the
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IEEE P1003.2b draft standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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<hr>
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<hr size="2" noshade>
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<center><font size="2"><!--footer start-->
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href=
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"../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>
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]</font></center>
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