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-<head>
-<title>UK TeX FAQ -- question label ltxhash</title>
-</head><body>
-<h3>Defining LaTeX commands within other commands</h3>
-<p/>LaTeX command definition is significantly different from the TeX
-primitive form discussed in an
-<a href="FAQ-hash.html">earlier question</a> about definitions within
-macros.
-<p/>In most ways, the LaTeX situation is simpler (at least in part
-because it imposes more restrictions on the user); however, defining a
-command within a command still requires some care.
-<p/>The earlier question said you have to double the <code>#</code> signs in command
-definitions: in fact, the same rule holds, except that LaTeX
-already takes care of some of the issues, by generating argument lists
-for you.
-<p/>The basic problem is that:
-<blockquote>
-<pre>
-\newcommand{\abc}[1]{joy, oh #1!%
- \newcommand{\ghi}[1]{gloom, oh #1!}%
-}
-</pre>
-</blockquote><p>
-followed by a call:
-<blockquote>
-<pre>
-\cmdinvoke{abc}{joy}
-</pre>
-</blockquote><p>
-typesets &#8220;joy, oh joy!&#8221;, but defines a command <code>\</code><code>ghi</code> that takes
-one parameter, which it ignores; <code>\</code><code>ghi{gloom}</code> will expand to
-&#8220;gloom, oh joy!&#8221;, which is presumably not what was expected.
-<p/>And (as you will probably guess, if you&#8217;ve read the earlier question)
-the definition:
-<blockquote>
-<pre>
-\newcommand{\abc}[1]{joy, oh #1!%
- \newcommand{\ghi}[1]{gloom, oh ##1!}%
-}
-</pre>
-</blockquote><p>
-does what is required, and <code>\</code><code>ghi{gloom}</code> will expand to
-&#8220;gloom, oh gloom!&#8221;, whatever the argument to <code>\</code><code>abc</code>.
-<p/>The doubling is needed whether or not the enclosing command has an
-argument, so:
-<blockquote>
-<pre>
-\newcommand{\abc}{joy, oh joy!%
- \newcommand{\ghi}[1]{gloom, oh ##1!}%
-}
-</pre>
-</blockquote><p>
-is needed to produce a replica of the <code>\</code><code>ghi</code> we defined earlier.
-<p/><p/><p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=ltxhash">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=ltxhash</a>
-</body>