<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- This manual is for GNU Texinfo (version 6.7, 23 September 2019),
a documentation system that can produce both online information and a
printed manual from a single source using semantic markup.
Copyright (C) 1988, 1990, 1991, 1992, 1993, 1995, 1996, 1997,
1998, 1999, 2001, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Free Software
Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
Texts. A copy of the license is included in the section entitled
"GNU Free Documentation License". -->
<!-- Created by GNU Texinfo 6.7, http://www.gnu.org/software/texinfo/ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>@set @clear @value (GNU Texinfo 6.7)</title>
<meta name="description" content="@set @clear @value (GNU Texinfo 6.7)">
<meta name="keywords" content="@set @clear @value (GNU Texinfo 6.7)">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="texi2any">
<link href="index.html" rel="start" title="Top">
<link href="Command-and-Variable-Index.html" rel="index" title="Command and Variable Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="Conditionals.html" rel="up" title="Conditionals">
<link href="_0040set-_0040value.html" rel="next" title="@set @value">
<link href="Inline-Conditionals.html" rel="prev" title="Inline Conditionals">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
kbd {font-style: oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
span.nolinebreak {white-space: nowrap}
span.roman {font-family: initial; font-weight: normal}
span.sansserif {font-family: sans-serif; font-weight: normal}
ul.no-bullet {list-style: none}
-->
</style>
</head>
<body lang="en">
<span id="g_t_0040set-_0040clear-_0040value"></span><div class="header">
<p>
Next: <a href="Testing-for-Texinfo-Commands.html" accesskey="n" rel="next">Testing for Texinfo Commands</a>, Previous: <a href="Inline-Conditionals.html" accesskey="p" rel="prev">Inline Conditionals</a>, Up: <a href="Conditionals.html" accesskey="u" rel="up">Conditionals</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<span id="Flags_003a-_0040set_002c-_0040clear_002c-conditionals_002c-and-_0040value"></span><h3 class="section">16.5 Flags: <code>@set</code>, <code>@clear</code>, conditionals, and <code>@value</code></h3>
<span id="set-clear-value"></span><p>You can direct the Texinfo formatting commands to format or ignore parts
of a Texinfo file with the <code>@set</code>, <code>@clear</code>, <code>@ifset</code>,
and <code>@ifclear</code> commands.
</p>
<p>Here are brief descriptions of these commands, see the following
sections for more details:
</p>
<dl compact="compact">
<dt><code>@set <var>flag</var> [<var>value</var>]</code></dt>
<dd><p>Set the variable <var>flag</var>, to the optional <var>value</var> if specified.
</p>
</dd>
<dt><code>@clear <var>flag</var></code></dt>
<dd><p>Undefine the variable <var>flag</var>, whether or not it was previously defined.
</p>
</dd>
<dt><code>@ifset <var>flag</var></code></dt>
<dd><p>If <var>flag</var> is set, text through the next <code>@end ifset</code> command
is formatted. If <var>flag</var> is clear, text through the following
<code>@end ifset</code> command is ignored.
</p>
</dd>
<dt><code>@inlineifset{<var>flag</var>, <var>text</var>}</code></dt>
<dd><p>Brace-delimited version of <code>@ifset</code>.
</p>
</dd>
<dt><code>@ifclear <var>flag</var></code></dt>
<dd><p>If <var>flag</var> is set, text through the next <code>@end ifclear</code> command
is ignored. If <var>flag</var> is clear, text through the following
<code>@end ifclear</code> command is formatted.
</p>
</dd>
<dt><code>@inlineifclear{<var>flag</var>, <var>text</var>}</code></dt>
<dd><p>Brace-delimited version of <code>@ifclear</code>.
</p>
</dd>
</dl>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">• <a href="_0040set-_0040value.html" accesskey="1"><code>@set @value</code></a></td><td> </td><td align="left" valign="top">Expand a flag variable to a string.
</td></tr>
<tr><td align="left" valign="top">• <a href="_0040ifset-_0040ifclear.html" accesskey="2"><code>@ifset @ifclear</code></a></td><td> </td><td align="left" valign="top">Format a region if a flag is set.
</td></tr>
<tr><td align="left" valign="top">• <a href="_0040inlineifset-_0040inlineifclear.html" accesskey="3"><code>@inlineifset @inlineifclear</code></a></td><td> </td><td align="left" valign="top">Brace-delimited flag conditionals.
</td></tr>
<tr><td align="left" valign="top">• <a href="_0040value-Example.html" accesskey="4"><code>@value</code> Example</a></td><td> </td><td align="left" valign="top">An easy way to update edition information.
</td></tr>
</table>
</body>
</html>