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📁 unix 下的C开发手册,还用详细的例程。
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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>pcat</title></head><body bgcolor=white><center><font size=2>The Single UNIX &reg; Specification, Version 2<br>Copyright &copy; 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_001_014_1707">&nbsp;</a>NAME</h4><blockquote>pcat - expand and concatenate files (<b><a href="intro.html#tag_001_003_003">LEGACY</a></b>)</blockquote><h4><a name = "tag_001_014_1708">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>pcat <i>file</i>...</code></pre></blockquote><h4><a name = "tag_001_014_1709">&nbsp;</a>DESCRIPTION</h4><blockquote>The<i>pcat</i>utility unpacks files in the format used by<i><a href="pack.html">pack</a></i>and writes the unpacked form to standard output.For each<i>file</i>operand, a file named<i>file</i><b>.z</b>(or just<i>file</i>,if<i>file</i>ends in<b>.z</b>)is unpacked.<p>A file is not written in its unpacked form if:<ul><p><li>The file cannot be opened.<p><li>The file does not appear to be the output of<i><a href="pack.html">pack</a></i>.<p></ul></blockquote><h4><a name = "tag_001_014_1710">&nbsp;</a>OPTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1711">&nbsp;</a>OPERANDS</h4><blockquote>The following operand is supported:<dl compact><dt><i>file</i><dd>A pathname of a file to be<i>pcat</i>ed;<i>file</i>can include or omit the<b>.z</b>suffix.</dl></blockquote><h4><a name = "tag_001_014_1712">&nbsp;</a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_1713">&nbsp;</a>INPUT FILES</h4><blockquote>The input files are regular filesin the format produced by the<i><a href="pack.html">pack</a></i>utility.</blockquote><h4><a name = "tag_001_014_1714">&nbsp;</a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables may affect the execution of<i>pcat</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).<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_1715">&nbsp;</a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_1716">&nbsp;</a>STDOUT</h4><blockquote>The standard outputis the concatenation of the unpacked files identified by the<i>file</i>operands.</blockquote><h4><a name = "tag_001_014_1717">&nbsp;</a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_001_014_1718">&nbsp;</a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1719">&nbsp;</a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1720">&nbsp;</a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>Successful completion.<dt>&gt;0<dd>An error occurred.</dl></blockquote><h4><a name = "tag_001_014_1721">&nbsp;</a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_1722">&nbsp;</a>APPLICATION USAGE</h4><blockquote>The<i>pcat</i>utility does for packed files what<i><a href="cat.html">cat</a></i>does for ordinary files, except that<i>pcat</i>cannot be used as a filter.<p>Applications should migrate to the<i>zcat</i>utility.</blockquote><h4><a name = "tag_001_014_1723">&nbsp;</a>EXAMPLES</h4><blockquote>To view a packed file named<i>file</i><b>.z</b>use:<pre><code>pcat <i>file</i>.z</code></pre>or:<pre><code>pcat <i>file</i></code></pre><p>To make an unpacked copy, called<b>abc</b>,of a packed file named<i>file</i><b>.z</b>(without destroying<i>file</i><b>.z</b>use:<pre><code>pcat <i>file</i> &gt;abc</code></pre></blockquote><h4><a name = "tag_001_014_1724">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1725">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="pack.html">pack</a></i>,<i><a href="unpack.html">unpack</a></i>,<i><a href="zcat.html">zcat</a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX &reg; is a registered Trademark of The Open Group.<br>Copyright &copy; 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>

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