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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=US-ASCII">
<title>Undo/redo</title>
<link rel="previous" href="Section3.8.1.html">
<link rel="ToC" href="contents.html">
<link rel="next" href="Section3.10.html">
</head>
<body>
<h1><a name="undo"></a>3.9 Undo/redo</h1>
<p>
The 'u'ndo command is used to undo or redo write changes done on the file.
</p>
<pre><code>&gt; u?
Usage: &gt; u 3   ; undo write change at index 3
       &gt; u -3  ; redo write change at index 3
       &gt; u     ; list all write changes
</code></pre>
<p>
Here's a sample session working with undo writes:
</p>
<pre><code>[0x00000000]&gt; wx 90 90 90 @ 0x100
[0x00000100]&gt; u                        ; list changes 
00 + 3 00000100: 89 90 c4 =&gt; 90 90 90 
</code></pre>
<pre><code>[0x00000000]&gt; p8 3 @ 0x100
90 90 90 
[0x00000000]&gt; u 0
[0x00000000]&gt; p8 3 @ 0x100
89 90 c4 
[0x00000000]&gt; u -0
[0x00000000]&gt; p8 3 @ 0x100
90 90 90 
</code></pre>
<p>
Note: Read 'undo-seek' for seeking history manipulation.
</p>

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