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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>GNU Texinfo 5.2: Conditionals</title>

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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
<a name="Conditionals"></a>
<div class="header">
<p>
Next: <a href="Defining-New-Texinfo-Commands.html#Defining-New-Texinfo-Commands" accesskey="n" rel="next">Defining New Texinfo Commands</a>, Previous: <a href="Internationalization.html#Internationalization" accesskey="p" rel="previous">Internationalization</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html#Command-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Conditionally-Visible-Text"></a>
<h2 class="chapter">18 Conditionally Visible Text</h2>
<a name="index-Conditionally-visible-text"></a>
<a name="index-Text_002c-conditionally-visible"></a>
<a name="index-Visibility-of-conditional-text"></a>
<a name="index-If-text-conditionally-visible"></a>

<p>The <em>conditional commands</em> allow you to use different text for
different output formats, or for general conditions that you define.
For example, you can use them to specify different text for the
printed manual and the Info output.
</p>
<p>The conditional commands comprise the following categories.
</p>
<ul>
<li> Commands specific to an output format (Info, TeX, HTML, &hellip;).

</li><li> Commands specific to any output format <em>excluding</em> a given
one (e.g., not Info, not TeX, &hellip;).

</li><li> &lsquo;Raw&rsquo; formatter text for any output format, passed straight
through with minimal (but not zero) interpretation of @-commands.

</li><li> Format-independent variable substitutions, and testing if a variable
is set or clear.

</li></ul>

<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="Conditional-Commands.html#Conditional-Commands" accesskey="1">Conditional Commands</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Text for a given format.
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Conditional-Not-Commands.html#Conditional-Not-Commands" accesskey="2">Conditional Not Commands</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Text for any format other than a given one.
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Raw-Formatter-Commands.html#Raw-Formatter-Commands" accesskey="3">Raw Formatter Commands</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Using raw formatter commands.
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Inline-Conditionals.html#Inline-Conditionals" accesskey="4">Inline Conditionals</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Brace-delimited conditional text.
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="_0040set-_0040clear-_0040value.html#g_t_0040set-_0040clear-_0040value" accesskey="5"><tt>@set @clear @value</tt></a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Variable tests and substitutions.
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Testing-for-Texinfo-Commands.html#Testing-for-Texinfo-Commands" accesskey="6">Testing for Texinfo Commands</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Testing if a Texinfo command is available.
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Conditional-Nesting.html#Conditional-Nesting" accesskey="7">Conditional Nesting</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Using conditionals inside conditionals.
</td></tr>
</table>





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