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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>logname</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="logname"></a> <a name="tag_04_79"></a><!-- logname --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_04_79_01"></a>NAME</h4><blockquote>logname - return the user's login name</blockquote><h4><a name="tag_04_79_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>logname</tt></code></p></blockquote><h4><a name="tag_04_79_03"></a>DESCRIPTION</h4><blockquote><p>The <i>logname</i> utility shall write the user's login name to standard output. The login name shall be the string that wouldbe returned by the <a href="../functions/getlogin.html"><i>getlogin</i>()</a> function defined in the System Interfaces volume ofIEEE Std 1003.1-2001. Under the conditions where the <a href="../functions/getlogin.html"><i>getlogin</i>()</a> functionwould fail, the <i>logname</i> utility shall write a diagnostic message to standard error and exit with a non-zero exit status.</p></blockquote><h4><a name="tag_04_79_04"></a>OPTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_79_05"></a>OPERANDS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_79_06"></a>STDIN</h4><blockquote><p>Not used.</p></blockquote><h4><a name="tag_04_79_07"></a>INPUT FILES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_79_08"></a>ENVIRONMENT VARIABLES</h4><blockquote><p>The following environment variables shall affect the execution of <i>logname</i>:</p><dl compact><dt><i>LANG</i></dt><dd>Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap08.html#tag_08_02">Section 8.2, Internationalization Variables</a> forthe precedence of internationalization variables used to determine the values of locale categories.)</dd><dt><i>LC_ALL</i></dt><dd>If set to a non-empty string value, override the values of all the other internationalization variables.</dd><dt><i>LC_CTYPE</i></dt><dd>Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte asopposed to multi-byte characters in arguments).</dd><dt><i>LC_MESSAGES</i></dt><dd>Determine the locale that should be used to affect the format and contents of diagnostic messages written to standarderror.</dd><dt><i>NLSPATH</i></dt><dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i> <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd></dl></blockquote><h4><a name="tag_04_79_09"></a>ASYNCHRONOUS EVENTS</h4><blockquote><p>Default.</p></blockquote><h4><a name="tag_04_79_10"></a>STDOUT</h4><blockquote><p>The <i>logname</i> utility output shall be a single line consisting of the user's login name:</p><pre><tt>"%s\n", <</tt><i>login name</i><tt>></tt></pre></blockquote><h4><a name="tag_04_79_11"></a>STDERR</h4><blockquote><p>The standard error shall be used only for diagnostic messages.</p></blockquote><h4><a name="tag_04_79_12"></a>OUTPUT FILES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_79_13"></a>EXTENDED DESCRIPTION</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_79_14"></a>EXIT STATUS</h4><blockquote><p>The following exit values shall be returned:</p><dl compact><dt> 0</dt><dd>Successful completion.</dd><dt>>0</dt><dd>An error occurred.</dd></dl></blockquote><h4><a name="tag_04_79_15"></a>CONSEQUENCES OF ERRORS</h4><blockquote><p>Default.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_04_79_16"></a>APPLICATION USAGE</h4><blockquote><p>The <i>logname</i> utility explicitly ignores the <i>LOGNAME</i> environment variable because environment changes could produceerroneous results.</p></blockquote><h4><a name="tag_04_79_17"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_79_18"></a>RATIONALE</h4><blockquote><p>The <b>passwd</b> file is not listed as required because the implementation may have other means of mapping login names.</p></blockquote><h4><a name="tag_04_79_19"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_79_20"></a>SEE ALSO</h4><blockquote><p><a href="id.html"><i>id</i></a>, <a href="who.html"><i>who</i></a>, the System Interfaces volume ofIEEE Std 1003.1-2001, <a href="../functions/getlogin.html"><i>getlogin</i>()</a></p></blockquote><h4><a name="tag_04_79_21"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 2.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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