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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>tsort</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_001_014_2372"> </a>NAME</h4><blockquote>tsort - topological sort</blockquote><h4><a name = "tag_001_014_2373"> </a>SYNOPSIS</h4><blockquote><pre><code>tsort <b>[</b><i>file</i><b>]</b></code></pre></blockquote><h4><a name = "tag_001_014_2374"> </a>DESCRIPTION</h4><blockquote>The<i>tsort</i>utilitywrites to standard output a totally ordered list of itemsconsistent with a partial ordering of itemscontained in the input.<p>The input consists of pairs of items (non-empty strings)separated by blanks.Pairs of different items indicate ordering.Pairs of identical items indicate presence, but not ordering.</blockquote><h4><a name = "tag_001_014_2375"> </a>OPTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2376"> </a>OPERANDS</h4><blockquote>The following operand is supported:<dl compact><dt><i>file</i><dd>A pathname of a text file to order.If no<i>file</i>operand is given, the standard input is used.</dl></blockquote><h4><a name = "tag_001_014_2377"> </a>STDIN</h4><blockquote>The standard input is a text file that is used if no<i>file</i>operand is given.</blockquote><h4><a name = "tag_001_014_2378"> </a>INPUT FILES</h4><blockquote>The input file named by the<i>file</i>operand is a text file.</blockquote><h4><a name = "tag_001_014_2379"> </a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>tsort</i>:<dl compact><dt><i>LANG</i><dd>Provide a default value for the internationalisation variablesthat are unset or null.If<i>LANG</i>is unset or null, the corresponding value from theimplementation-dependent default locale will be used.If any of the internationalisation variables contains an invalid setting, theutility will behave as if none of the variables had been defined.<dt><i>LC_ALL</i><dd>If set to a non-empty string value,override the values of all the other internationalisation variables.<dt><i>LC_CTYPE</i><dd>Determine thelocale for the interpretation of sequences of bytes of text data ascharacters (for example, single- as opposed to multi-byte charactersin arguments and input files).<dt><i>LC_MESSAGES</i><dd>Determine the locale that should be used to affectthe format and contents of diagnosticmessages written to standard error.<dt><i>NLSPATH</i><dd>Determine the location of message cataloguesfor the processing of<i>LC_MESSAGES .</i></dl></blockquote><h4><a name = "tag_001_014_2380"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_2381"> </a>STDOUT</h4><blockquote>The standard output is a text file consisting of the order listproduced from the partially ordered input.</blockquote><h4><a name = "tag_001_014_2382"> </a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_001_014_2383"> </a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2384"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2385"> </a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>Successful completion.<dt>>0<dd>An error occurred.</dl></blockquote><h4><a name = "tag_001_014_2386"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_2387"> </a>APPLICATION USAGE</h4><blockquote>The<i>LC_COLLATE</i>variable need not affect the actions of<i>tsort</i>.The output ordering is not lexicographic,but depends on the pairs of items given as input.</blockquote><h4><a name = "tag_001_014_2388"> </a>EXAMPLES</h4><blockquote>The command:<pre><code>tsort <<EOFa b c c d eg gf g e fh hEOF</code></pre><p>produces the output:<pre><code>abcdefgh</code></pre><p></blockquote><h4><a name = "tag_001_014_2389"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2390"> </a>SEE ALSO</h4><blockquote>None.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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