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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>what</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_2866"> </a>NAME</h4><blockquote>what - identify SCCS files (<b>DEVELOPMENT</b>)</blockquote><h4><a name = "tag_001_014_2867"> </a>SYNOPSIS</h4><blockquote><pre><code>what <b>[</b>-s<b>] </b><i>file</i>...</code></pre></blockquote><h4><a name = "tag_001_014_2868"> </a>DESCRIPTION</h4><blockquote>The<i>what</i>utility searches the given files for all occurrences of the pattern that<i><a href="get.html">get</a></i>(see<i><a href="get.html">get</a></i>)substitutes for<b>%Z%</b>(@(#))and writes to standard output what follows until the first occurrenceof one of the following:<pre><code>" > newline \ NUL</code></pre></blockquote><h4><a name = "tag_001_014_2869"> </a>OPTIONS</h4><blockquote>The<i>what</i>utility supports the <b>XBD</b> specification, <a href="../xbd/utilconv.html#usg"><b>Utility Syntax Guidelines</b> </a> .The following option is supported:<dl compact><dt><b>-s</b><dd>Quit after finding the first occurrence of the pattern in each file.</dl></blockquote><h4><a name = "tag_001_014_2870"> </a>OPERANDS</h4><blockquote>The following operands are supported:<dl compact><dt><i>file</i><dd>A pathname of a file to search.</dl></blockquote><h4><a name = "tag_001_014_2871"> </a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_2872"> </a>INPUT FILES</h4><blockquote>The input files are of any file type.</blockquote><h4><a name = "tag_001_014_2873"> </a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>what</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_2874"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.<br></blockquote><h4><a name = "tag_001_014_2875"> </a>STDOUT</h4><blockquote>The standard output consists of the following for each<i>file</i>operand:<p><code><tt>"%s:\n\t%s\n"</tt>, <<i>pathname</i>>,<<i>identification string</i>></code></blockquote><h4><a name = "tag_001_014_2876"> </a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_001_014_2877"> </a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2878"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2879"> </a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>Any matches were found.<dt>1<dd>Otherwise.</dl></blockquote><h4><a name = "tag_001_014_2880"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_2881"> </a>APPLICATION USAGE</h4><blockquote>The<i>what</i>utilityis intended to be used in conjunction with the SCCS command<i><a href="get.html">get</a></i>,which automatically inserts identifying information,but it can also be used where the information is insertedby any other means.<p>When the string "@(#)" is includedin a library routine in a shared library, it might not be found in an<b>a.out</b>file using that library routine.</blockquote><h4><a name = "tag_001_014_2882"> </a>EXAMPLES</h4><blockquote>If the C-language program in file<b>f.c</b>contains:<pre><code>char ident[] = "@(#)identification information";</code></pre><p><p>and<b>f.c</b>is compiled to yield<b>f.o</b>and<b>a.out</b>then the command:<pre><code>what f.c f.o a.out</code></pre><p>will write:<pre><code>f.c: identification information ...f.o: identification information ...a.out: identification information ...</code></pre></blockquote><h4><a name = "tag_001_014_2883"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2884"> </a>SEE ALSO</h4><blockquote><i><a href="get.html">get</a></i>.<br></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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