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@@ -50,5 +50,12 @@ program; however, if your arguments never start with a backslash, it exhibits th
exact same behaviour.
</p>
+<h2> Non-standard expressions </h2>
+
+<ul>
+ <li> <tt>-v&nbsp;<em>VAR</em></tt>&nbsp;: tests whether the
+<em>VAR</em> variable is defined in the current environment. </li>
+</ul>
+
</body>
</html>