261 lines
8.0 KiB
HTML
261 lines
8.0 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>unget</title>
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<basefont size="3"> <a name="unget"></a> <a name="tag_04_157"></a><!-- unget -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_04_157_01"></a>NAME</h4>
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<blockquote>unget - undo a previous get of an SCCS file (<b>DEVELOPMENT</b>)</blockquote>
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<h4><a name="tag_04_157_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[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=
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"../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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</blockquote>
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<h4><a name="tag_04_157_03"></a>DESCRIPTION</h4>
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<blockquote>
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<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 to
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creating the intended new delta.</p>
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</blockquote>
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<h4><a name="tag_04_157_04"></a>OPTIONS</h4>
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<blockquote>
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<p>The <i>unget</i> utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/xbd_chap12.html#tag_12_02">Section 12.2, Utility Syntax Guidelines</a>.</p>
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<p>The following options shall be supported:</p>
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<dl compact>
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<dt><b>-r </b> <i>SID</i></dt>
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<dd>Uniquely identify which delta is no longer intended. (This would have been specified by <a href=
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"../utilities/get.html"><i>get</i></a> as the new delta.) The use of this option is necessary only if two or more outstanding <a
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href="../utilities/get.html"><i>get</i></a> commands for editing on the same SCCS file were done by the same person (login
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name).</dd>
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<dt><b>-s</b></dt>
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<dd>Suppress the writing to standard output of the intended delta's SID.</dd>
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<dt><b>-n</b></dt>
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<dd>Retain the file that was obtained by <a href="../utilities/get.html"><i>get</i></a>, which would normally be removed from the
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current directory.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_157_05"></a>OPERANDS</h4>
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<blockquote>
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<p>The following operands shall be supported:</p>
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<dl compact>
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<dt><i>file</i></dt>
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<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 as
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though each file in the directory were specified as a named file, except that non-SCCS files (last component of the pathname does
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not begin with <b>s.</b>) and unreadable files shall be silently ignored.
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<p>If exactly one <i>file</i> operand appears, and it is <tt>'-'</tt> , the standard input shall be read; each line of the standard
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input shall be taken to be the name of an SCCS file to be processed. Non-SCCS files and unreadable files shall be silently
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ignored.</p>
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</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_157_06"></a>STDIN</h4>
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<blockquote>
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<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 the
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text file shall be interpreted as an SCCS pathname.</p>
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</blockquote>
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<h4><a name="tag_04_157_07"></a>INPUT FILES</h4>
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<blockquote>
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<p>Any SCCS files processed shall be files of an unspecified format.</p>
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</blockquote>
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<h4><a name="tag_04_157_08"></a>ENVIRONMENT VARIABLES</h4>
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<blockquote>
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<p>The following environment variables shall affect the execution of <i>unget</i>:</p>
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<dl compact>
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<dt><i>LANG</i></dt>
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<dd>Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap08.html#tag_08_02">Section 8.2, Internationalization Variables</a> for
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the precedence of internationalization variables used to determine the values of locale categories.)</dd>
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<dt><i>LC_ALL</i></dt>
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<dd>If set to a non-empty string value, override the values of all the other internationalization variables.</dd>
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<dt><i>LC_CTYPE</i></dt>
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<dd>Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as
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opposed to multi-byte characters in arguments and input files).</dd>
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<dt><i>LC_MESSAGES</i></dt>
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<dd>Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard
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error.</dd>
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<dt><i>NLSPATH</i></dt>
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<dd>Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i></dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_157_09"></a>ASYNCHRONOUS EVENTS</h4>
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<blockquote>
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<p>Default.</p>
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</blockquote>
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<h4><a name="tag_04_157_10"></a>STDOUT</h4>
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<blockquote>
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<p>The standard output shall consist of a line for each file, in the following format:</p>
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<pre>
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<tt>"%s\n", <</tt><i>SID removed from file</i><tt>>
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</tt>
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</pre>
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<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 of
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the preceding lines:</p>
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<pre>
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<tt>"\n%s:\n", <</tt><i>pathname</i><tt>>
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_04_157_11"></a>STDERR</h4>
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<blockquote>
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<p>The standard error shall be used only for diagnostic messages.</p>
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</blockquote>
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<h4><a name="tag_04_157_12"></a>OUTPUT FILES</h4>
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<blockquote>
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<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>, as
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described 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 be
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created 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 be
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deleted.</p>
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</blockquote>
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<h4><a name="tag_04_157_13"></a>EXTENDED DESCRIPTION</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_157_14"></a>EXIT STATUS</h4>
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<blockquote>
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<p>The following exit values shall be returned:</p>
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<dl compact>
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<dt> 0</dt>
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<dd>Successful completion.</dd>
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<dt>>0</dt>
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<dd>An error occurred.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_157_15"></a>CONSEQUENCES OF ERRORS</h4>
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<blockquote>
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<p>Default.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_04_157_16"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_157_17"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_157_18"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_157_19"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_157_20"></a>SEE ALSO</h4>
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<blockquote>
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<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>
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</blockquote>
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<h4><a name="tag_04_157_21"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 2.</p>
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</blockquote>
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<h4><a name="tag_04_157_22"></a>Issue 6</h4>
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<blockquote>
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<p>The normative text is reworded to avoid use of the term "must" for application requirements.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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<hr>
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<hr size="2" noshade>
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<center><font size="2"><!--footer start-->
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href=
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"../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>
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]</font></center>
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