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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>what</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="what"></a> <a name="tag_04_170"></a><!-- what --> <!--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_170_01"></a>NAME</h4><blockquote>what - identify SCCS files (<b>DEVELOPMENT</b>)</blockquote><h4><a name="tag_04_170_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"> what</tt> <b>[</b><tt>-s</tt><b>]</b> <i>file</i><tt>... <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div></blockquote><h4><a name="tag_04_170_03"></a>DESCRIPTION</h4><blockquote><p>The <i>what</i> utility shall search the given files for all occurrences of the pattern that <a href="../utilities/get.html"><i>get</i></a> (see <a href="get.html"><i>get</i></a> ) substitutes for the %<b>Z</b>% keyword (<tt>"@(#)"</tt> ) and shall write to standard output what follows until the first occurrence of one of the following:</p><pre><tt>" > newline \ NUL</tt></pre></blockquote><h4><a name="tag_04_170_04"></a>OPTIONS</h4><blockquote><p>The <i>what</i> utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap12.html#tag_12_02">Section 12.2, Utility Syntax Guidelines</a>.</p><p>The following option shall be supported:</p><dl compact><dt><b>-s</b></dt><dd>Quit after finding the first occurrence of the pattern in each file.</dd></dl></blockquote><h4><a name="tag_04_170_05"></a>OPERANDS</h4><blockquote><p>The following operands shall be supported:</p><dl compact><dt><i>file</i></dt><dd>A pathname of a file to search.</dd></dl></blockquote><h4><a name="tag_04_170_06"></a>STDIN</h4><blockquote><p>Not used.</p></blockquote><h4><a name="tag_04_170_07"></a>INPUT FILES</h4><blockquote><p>The input files shall be of any file type.</p></blockquote><h4><a name="tag_04_170_08"></a>ENVIRONMENT VARIABLES</h4><blockquote><p>The following environment variables shall affect the execution of <i>what</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_170_09"></a>ASYNCHRONOUS EVENTS</h4><blockquote><p>Default.</p></blockquote><h4><a name="tag_04_170_10"></a>STDOUT</h4><blockquote><p>The standard output shall consist of the following for each <i>file</i> operand:</p><pre><tt>"%s:\n\t%s\n", <</tt><i>pathname</i><tt>>, <</tt><i>identification string</i><tt>></tt></pre></blockquote><h4><a name="tag_04_170_11"></a>STDERR</h4><blockquote><p>The standard error shall be used only for diagnostic messages.</p></blockquote><h4><a name="tag_04_170_12"></a>OUTPUT FILES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_170_13"></a>EXTENDED DESCRIPTION</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_170_14"></a>EXIT STATUS</h4><blockquote><p>The following exit values shall be returned:</p><dl compact><dt>0</dt><dd>Any matches were found.</dd><dt>1</dt><dd>Otherwise.</dd></dl></blockquote><h4><a name="tag_04_170_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_170_16"></a>APPLICATION USAGE</h4><blockquote><p>The <i>what</i> utility is intended to be used in conjunction with the SCCS command <a href="../utilities/get.html"><i>get</i></a>, which automatically inserts identifying information, but it can also be used where theinformation is inserted by any other means.</p><p>When the string <tt>"@(#)"</tt> is included in a library routine in a shared library, it might not be found in an <b>a.out</b>file using that library routine.</p></blockquote><h4><a name="tag_04_170_17"></a>EXAMPLES</h4><blockquote><p>If the C-language program in file <b>f.c</b> contains:</p><pre><tt>char ident[] = "@(#)identification information";</tt></pre><p>and <b>f.c</b> is compiled to yield <b>f.o</b> and <b>a.out</b>, then the command:</p><pre><tt>what f.c f.o a.out</tt></pre><p>writes:</p><pre><tt>f.c: identification information ...f.o: identification information ...a.out: identification information ...</tt></pre></blockquote><h4><a name="tag_04_170_18"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_170_19"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_170_20"></a>SEE ALSO</h4><blockquote><p><a href="get.html"><i>get</i></a></p></blockquote><h4><a name="tag_04_170_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><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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