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<head><title>UBT_bang_.html -- ACL2 Version 3.1</title></head>
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<h2>UBT!</h2>undo <a href="COMMAND.html">command</a>s, without a query or an error
<pre>Major Section: <a href="HISTORY.html">HISTORY</a>
</pre><p>
<pre>
Example:
:ubt! :x-4
</pre>
<p>
The keyword <a href="COMMAND.html">command</a> <code>:ubt!</code> is the same as <code>:</code><code><a href="UBT.html">ubt</a></code>, but with related
queries suppressed appropriately, and with a guarantee that it is
``error-free.'' More precisely, the error triple returned by <code>:ubt!</code>
will always have a first component of <code>nil</code>. <code>:</code><code><a href="OOPS.html">Oops</a></code> will undo the last
<code>:ubt!</code>. See <a href="UBT.html">ubt</a>, see <a href="UBU.html">ubu</a>, and see <a href="U.html">u</a>.
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