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<a name="Comments"></a>
<div class="header">
<p>
Next: <a href="Other-tokens.html#Other-tokens" accesskey="n" rel="next">Other tokens</a>, Previous: <a href="Quoted-strings.html#Quoted-strings" accesskey="p" rel="prev">Quoted strings</a>, Up: <a href="Syntax.html#Syntax" accesskey="u" rel="up">Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Comments-in-m4-input"></a>
<h3 class="section">3.3 Comments in <code>m4</code> input</h3>
<a name="index-comments"></a>
<p>Comments in <code>m4</code> are normally delimited by the characters ‘<samp>#</samp>’
and newline. All characters between the comment delimiters are ignored,
but the entire comment (including the delimiters) is passed through to
the output—comments are <em>not</em> discarded by <code>m4</code>.
</p>
<p>Comments cannot be nested, so the first newline after a ‘<samp>#</samp>’ ends
the comment. The commenting effect of the begin-comment string
can be inhibited by quoting it.
</p>
<div class="example">
<pre class="example">$ <kbd>m4</kbd>
`quoted text' # `commented text'
⇒quoted text # `commented text'
`quoting inhibits' `#' `comments'
⇒quoting inhibits # comments
</pre></div>
<p>The comment delimiters can be changed to any string at any time, using
the builtin macro <code>changecom</code>. See <a href="Changecom.html#Changecom">Changecom</a>, for more
information.
</p>
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