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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) 2001-2003 The Open Group, All Rights Reserved --><title>tsort</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="tsort"></a> <a name="tag_04_148"></a><!-- tsort --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_04_148_01"></a>NAME</h4><blockquote>tsort - topological sort</blockquote><h4><a name="tag_04_148_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> tsort</tt> <b>[</b><i>file</i><b>]</b><tt><img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div></blockquote><h4><a name="tag_04_148_03"></a>DESCRIPTION</h4><blockquote><p>The <i>tsort</i> utility shall write to standard output a totally ordered list of items consistent with a partial ordering ofitems contained in the input.</p><p>The application shall ensure that the input consists of pairs of items (non-empty strings) separated by <blank>s. Pairs ofdifferent items indicate ordering. Pairs of identical items indicate presence, but not ordering.</p></blockquote><h4><a name="tag_04_148_04"></a>OPTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_148_05"></a>OPERANDS</h4><blockquote><p>The following operand shall be supported:</p><dl compact><dt><i>file</i></dt><dd>A pathname of a text file to order. If no <i>file</i> operand is given, the standard input shall be used.</dd></dl></blockquote><h4><a name="tag_04_148_06"></a>STDIN</h4><blockquote><p>The standard input shall be a text file that is used if no <i>file</i> operand is given.</p></blockquote><h4><a name="tag_04_148_07"></a>INPUT FILES</h4><blockquote><p>The input file named by the <i>file</i> operand is a text file.</p></blockquote><h4><a name="tag_04_148_08"></a>ENVIRONMENT VARIABLES</h4><blockquote><p>The following environment variables shall affect the execution of <i>tsort</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 and input files).</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>Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i></dd></dl></blockquote><h4><a name="tag_04_148_09"></a>ASYNCHRONOUS EVENTS</h4><blockquote><p>Default.</p></blockquote><h4><a name="tag_04_148_10"></a>STDOUT</h4><blockquote><p>The standard output shall be a text file consisting of the order list produced from the partially ordered input.</p></blockquote><h4><a name="tag_04_148_11"></a>STDERR</h4><blockquote><p>The standard error shall be used only for diagnostic messages.</p></blockquote><h4><a name="tag_04_148_12"></a>OUTPUT FILES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_148_13"></a>EXTENDED DESCRIPTION</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_148_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_148_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_148_16"></a>APPLICATION USAGE</h4><blockquote><p>The <i>LC_COLLATE</i> variable need not affect the actions of <i>tsort</i>. The output ordering is not lexicographic, butdepends on the pairs of items given as input.</p></blockquote><h4><a name="tag_04_148_17"></a>EXAMPLES</h4><blockquote><p>The command:</p><pre><tt>tsort <<EOFa b c c d eg gf g e fh hEOF</tt></pre><p>produces the output:</p><pre><b>abcdefgh</b></pre></blockquote><h4><a name="tag_04_148_18"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_148_19"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_148_20"></a>SEE ALSO</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_148_21"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 2.</p></blockquote><h4><a name="tag_04_148_22"></a>Issue 6</h4><blockquote><p>The normative text is reworded to avoid use of the term "must" for application requirements.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><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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