198 lines
4.8 KiB
HTML
198 lines
4.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>exit</title>
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</head>
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<body bgcolor="white">
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<basefont size="3"> <a name="exit"></a> <a name="tag_04_47"></a><!-- exit -->
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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_47_01"></a>NAME</h4>
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<blockquote>exit - cause the shell to exit</blockquote>
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<h4><a name="tag_04_47_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>exit</tt> <b>[</b><i>n</i><b>]</b></code></p>
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</blockquote>
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<h4><a name="tag_04_47_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>exit</i> utility shall cause the shell to exit with the exit status specified by the unsigned decimal integer <i>n</i>.
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If <i>n</i> is specified, but its value is not between 0 and 255 inclusively, the exit status is undefined.</p>
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<p>A <a href="../utilities/trap.html"><i>trap</i></a> on <b>EXIT</b> shall be executed before the shell terminates, except when the
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<i>exit</i> utility is invoked in that <a href="../utilities/trap.html"><i>trap</i></a> itself, in which case the shell shall exit
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immediately.</p>
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</blockquote>
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<h4><a name="tag_04_47_04"></a>OPTIONS</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_47_05"></a>OPERANDS</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_47_06"></a>STDIN</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_47_07"></a>INPUT FILES</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_47_08"></a>ENVIRONMENT VARIABLES</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_47_09"></a>ASYNCHRONOUS EVENTS</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_47_10"></a>STDOUT</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_47_11"></a>STDERR</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_47_12"></a>OUTPUT FILES</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_47_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_47_14"></a>EXIT STATUS</h4>
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<blockquote>
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<p>The exit status shall be <i>n</i>, if specified. Otherwise, the value shall be the exit value of the last command executed, or
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zero if no command was executed. When <i>exit</i> is executed in a <a href="../utilities/trap.html"><i>trap</i></a> action, the
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last command is considered to be the command that executed immediately preceding the <a href=
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"../utilities/trap.html"><i>trap</i></a> action.</p>
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</blockquote>
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<h4><a name="tag_04_47_15"></a>CONSEQUENCES OF ERRORS</h4>
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<blockquote>
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<p>None.</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_47_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_47_17"></a>EXAMPLES</h4>
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<blockquote>
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<p>Exit with a <i>true</i> value:</p>
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<pre>
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<tt>exit 0
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</tt>
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</pre>
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<p>Exit with a <i>false</i> value:</p>
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<pre>
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<tt>exit 1
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_04_47_18"></a>RATIONALE</h4>
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<blockquote>
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<p>As explained in other sections, certain exit status values have been reserved for special uses and should be used by
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applications only for those purposes:</p>
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<dl compact>
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<dt> 126</dt>
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<dd>A file to be executed was found, but it was not an executable utility.</dd>
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<dt> 127</dt>
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<dd>A utility to be executed was not found.</dd>
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<dt>>128</dt>
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<dd>A command was interrupted by a signal.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_47_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_47_20"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="xcu_chap02.html#tag_02_14"><i>Special Built-In Utilities</i></a></p>
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</blockquote>
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<h4><a name="tag_04_47_21"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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