+</pre></div><div class="sect1" lang="en" xml:lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="set"></a>26. Setting and Querying Variables</h2></div></div></div><div class="sect2" lang="en" xml:lang="en"><div class="titlepage"><div><div><h3 class="title"><a id="var-types"></a>26.1. Variable Types</h3></div></div></div><p>
+Mutt supports these types of configuration variables:
+</p><div class="variablelist"><dl><dt><span class="term">boolean</span></dt><dd><p>
+A boolean expression, either “<span class="quote">yes</span>” or “<span class="quote">no</span>”.
+</p></dd><dt><span class="term">number</span></dt><dd><p>
+A signed integer number in the range -32768 to 32767.
+</p></dd><dt><span class="term">string</span></dt><dd><p>
+Arbitrary text.
+</p></dd><dt><span class="term">path</span></dt><dd><p>
+A specialized string for representing paths including support for
+mailbox shortcuts (see <a class="xref" href="advancedusage.html#shortcuts" title="7. Mailbox Shortcuts">Section 7, “Mailbox Shortcuts”</a>) as well as tilde
+(“<span class="quote">˜</span>”) for a user's home directory and more.
+</p></dd><dt><span class="term">quadoption</span></dt><dd><p>
+Like a boolean but triggers a prompt when set to “<span class="quote">ask-yes</span>”
+or “<span class="quote">ask-no</span>” with “<span class="quote">yes</span>” and “<span class="quote">no</span>”
+preselected respectively.
+</p></dd><dt><span class="term">sort order</span></dt><dd><p>
+A specialized string allowing only particular words as values depending
+on the variable.
+</p></dd><dt><span class="term">regular expression</span></dt><dd><p>
+A regular expression, see <a class="xref" href="advancedusage.html#regexp" title="1. Regular Expressions">Section 1, “Regular Expressions”</a> for an introduction.
+</p></dd><dt><span class="term">folder magic</span></dt><dd><p>
+Specifies the type of folder to use: <span class="emphasis"><em>mbox</em></span>,
+<span class="emphasis"><em>mmdf</em></span>, <span class="emphasis"><em>mh</em></span>
+or <span class="emphasis"><em>maildir</em></span>.
+Currently only used to determine the type for newly created folders.
+</p></dd><dt><span class="term">e-mail address</span></dt><dd><p>
+An e-mail address either with or without
+realname. The older “<span class="quote"><code class="literal">user@example.org (Joe User)</code></span>”
+form is supported but strongly deprecated.
+</p></dd><dt><span class="term">user-defined</span></dt><dd><p>
+Arbitrary text, see <a class="xref" href="configuration.html#set-myvar" title="26.3. User-Defined Variables">Section 26.3, “User-Defined Variables”</a> for details.
+</p></dd></dl></div></div><div class="sect2" lang="en" xml:lang="en"><div class="titlepage"><div><div><h3 class="title"><a id="set-commands"></a>26.2. Commands</h3></div></div></div><p>