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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) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>unget</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="unget"></a> <a name="tag_04_157"></a><!-- unget --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_04_157_01"></a>NAME</h4><blockquote>unget - undo a previous get of an SCCS file (<b>DEVELOPMENT</b>)</blockquote><h4><a name="tag_04_157_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"> unget</tt> <b>[</b><tt>-ns</tt><b>][</b><tt>-r</tt> <i>SID</i><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_157_03"></a>DESCRIPTION</h4><blockquote><p>The <i>unget</i> utility shall reverse the effect of a <a href="../utilities/get.html"><i>get</i></a> <b>-e</b> done prior tocreating the intended new delta.</p></blockquote><h4><a name="tag_04_157_04"></a>OPTIONS</h4><blockquote><p>The <i>unget</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 options shall be supported:</p><dl compact><dt><b>-r </b> <i>SID</i></dt><dd>Uniquely identify which delta is no longer intended. (This would have been specified by <a href="../utilities/get.html"><i>get</i></a> as the new delta.) The use of this option is necessary only if two or more outstanding <ahref="../utilities/get.html"><i>get</i></a> commands for editing on the same SCCS file were done by the same person (loginname).</dd><dt><b>-s</b></dt><dd>Suppress the writing to standard output of the intended delta's SID.</dd><dt><b>-n</b></dt><dd>Retain the file that was obtained by <a href="../utilities/get.html"><i>get</i></a>, which would normally be removed from thecurrent directory.</dd></dl></blockquote><h4><a name="tag_04_157_05"></a>OPERANDS</h4><blockquote><p>The following operands shall be supported:</p><dl compact><dt><i>file</i></dt><dd>A pathname of an existing SCCS file or a directory. If <i>file</i> is a directory, the <i>unget</i> utility shall behave asthough each file in the directory were specified as a named file, except that non-SCCS files (last component of the pathname doesnot begin with <b>s.</b>) and unreadable files shall be silently ignored. <p>If exactly one <i>file</i> operand appears, and it is <tt>'-'</tt>, the standard input shall be read; each line of the standardinput shall be taken to be the name of an SCCS file to be processed. Non-SCCS files and unreadable files shall be silentlyignored.</p></dd></dl></blockquote><h4><a name="tag_04_157_06"></a>STDIN</h4><blockquote><p>The standard input shall be a text file used only when the <i>file</i> operand is specified as <tt>'-'</tt>. Each line of thetext file shall be interpreted as an SCCS pathname.</p></blockquote><h4><a name="tag_04_157_07"></a>INPUT FILES</h4><blockquote><p>Any SCCS files processed shall be files of an unspecified format.</p></blockquote><h4><a name="tag_04_157_08"></a>ENVIRONMENT VARIABLES</h4><blockquote><p>The following environment variables shall affect the execution of <i>unget</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_157_09"></a>ASYNCHRONOUS EVENTS</h4><blockquote><p>Default.</p></blockquote><h4><a name="tag_04_157_10"></a>STDOUT</h4><blockquote><p>The standard output shall consist of a line for each file, in the following format:</p><pre><tt>"%s\n", <</tt><i>SID removed from file</i><tt>></tt></pre><p>If there is more than one named file or if a directory or standard input is named, each pathname shall be written before each ofthe preceding lines:</p><pre><tt>"\n%s:\n", <</tt><i>pathname</i><tt>></tt></pre></blockquote><h4><a name="tag_04_157_11"></a>STDERR</h4><blockquote><p>The standard error shall be used only for diagnostic messages.</p></blockquote><h4><a name="tag_04_157_12"></a>OUTPUT FILES</h4><blockquote><p>Any SCCS files updated shall be files of an unspecified format. During processing of a <i>file</i>, a locking <i>z-file</i>, asdescribed in <a href="../utilities/get.html"><i>get</i></a>, and a <i>q-file</i> (a working copy of the <i>p-file</i>), may becreated and deleted. The <i>p-file</i> and <i>g-file</i>, as described in <a href="../utilities/get.html"><i>get</i></a>, shall bedeleted.</p></blockquote><h4><a name="tag_04_157_13"></a>EXTENDED DESCRIPTION</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_157_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_157_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_157_16"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_157_17"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_157_18"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_157_19"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_157_20"></a>SEE ALSO</h4><blockquote><p><a href="delta.html"><i>delta</i></a>, <a href="get.html"><i>get</i></a>, <a href="sact.html"><i>sact</i></a></p></blockquote><h4><a name="tag_04_157_21"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 2.</p></blockquote><h4><a name="tag_04_157_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 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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