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<html lang="en">
<head>
<title>Conditional Commands - GNU Texinfo 4.13</title>
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Next:&nbsp;<a rel="next" accesskey="n" href="Conditional-Not-Commands.html#Conditional-Not-Commands">Conditional Not Commands</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="Conditionals.html#Conditionals">Conditionals</a>
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<h3 class="section">17.1 Conditional Commands</h3>

<p>Texinfo has an <code>@if</code><var>format</var> environment for each output
format, to allow conditional inclusion of text for a particular output
format.

  <p><a name="index-ifinfo-998"></a><code>@ifinfo</code> begins segments of text that should be ignored by
TeX when it typesets the printed manual, and by <samp><span class="command">makeinfo</span></samp>
when not producing Info output.  The segment of text appears only in
the Info file and, for historical compatibility, the plain text
output.

  <p><a name="index-ifdocbook-999"></a><a name="index-ifhtml-1000"></a><a name="index-ifplaintext-1001"></a><a name="index-iftex-1002"></a><a name="index-ifxml-1003"></a>The environments for the other formats are analogous:

     <dl>
<dt><code>@ifdocbook ... @end ifdocbook</code><dd>Text to appear only in the Docbook output.

     <br><dt><code>@ifhtml ... @end ifhtml</code><dd>Text to appear only in the HTML output.

     <br><dt><code>@ifplaintext ... @end ifplaintext</code><dd>Text to appear only in the plain text output.

     <br><dt><code>@iftex ... @end iftex</code><dd>Text to appear only in the printed manual.

     <br><dt><code>@ifxml ... @end ifxml</code><dd>Text to appear only in the XML output. 
</dl>

  <p>The <code>@if...</code> and <code>@end if...</code> commands must appear
on lines by themselves in your source file.

  <p>Here is an example showing all these conditionals:

<pre class="example">     @iftex
     This text will appear only in the printed manual.
     @end iftex
     @ifinfo
     However, this text will appear only in Info and plain text.
     @end ifinfo
     @ifhtml
     And this text will only appear in HTML.
     @end ifhtml
     @ifplaintext
     Whereas this text will only appear in plain text.
     @end ifplaintext
     @ifxml
     Notwithstanding that this will only appear in XML.
     @end ifxml
     @ifdocbook
     Nevertheless, this will only appear in Docbook.
     @end ifdocbook
</pre>
  <p class="noindent">The preceding example produces the following line:

  <p>And this text will only appear in HTML.

<p class="noindent">Notice that you only see one of the input lines, depending on which
version of the manual you are reading.

  </body></html>

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