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<title>Comparing and Merging Files: Comparing and Merging Files</title>

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<a name="Comparing-and-Merging-Files"></a>
<h1 class="settitle">Comparing and Merging Files</h1>

<p>This manual is for GNU Diffutils
(version 3.2, 15 August 2011),
and documents the <acronym>GNU</acronym> <code>diff</code>, <code>diff3</code>,
<code>sdiff</code>, and <code>cmp</code> commands for showing the
differences between files and the <acronym>GNU</acronym> <code>patch</code> command for
using their output to update files.
</p>
<p>Copyright &copy; 1992-1994, 1998, 2001-2002, 2004, 2006, 2009-2011 Free
Software Foundation, Inc.
</p>
<blockquote><p>Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
A copy of the license is included in the section entitled
&ldquo;<acronym>GNU</acronym> Free Documentation License.&rdquo;
</p></blockquote>

<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="diffutils_1.html#Overview">Overview</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">              Preliminary information.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_2.html#Comparison">1. What Comparison Means</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">            What file comparison means.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_3.html#Output-Formats">2. <code>diff</code> Output Formats</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">        Formats for two-way difference reports.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_4.html#Incomplete-Lines">3. Incomplete Lines</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">      Lines that lack trailing newlines.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_5.html#Comparing-Directories">4. Comparing Directories</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top"> Comparing files and directories.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_6.html#Adjusting-Output">5. Making <code>diff</code> Output Prettier</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">      Making <code>diff</code> output prettier.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_7.html#diff-Performance">6. <code>diff</code> Performance Tradeoffs</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">      Making <code>diff</code> smarter or faster.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_8.html#Comparing-Three-Files">7. Comparing Three Files</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top"> Formats for three-way difference reports.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_9.html#diff3-Merging">8. Merging From a Common Ancestor</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">         Merging from a common ancestor.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_10.html#Interactive-Merging">9. Interactive Merging with <code>sdiff</code></a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">   Interactive merging with <code>sdiff</code>.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_11.html#Merging-with-patch">10. Merging with <code>patch</code></a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">    Using <code>patch</code> to change old files into new ones.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_12.html#Making-Patches">11. Tips for Making and Using Patches</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">        Tips for making and using patch distributions.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_13.html#Invoking-cmp">12. Invoking <code>cmp</code></a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">          Compare two files byte by byte.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_14.html#Invoking-diff">13. Invoking <code>diff</code></a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">         Compare two files line by line.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_15.html#Invoking-diff3">14. Invoking <code>diff3</code></a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">        Compare three files line by line.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_16.html#Invoking-patch">15. Invoking <code>patch</code></a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">        Apply a diff file to an original.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_17.html#Invoking-sdiff">16. Invoking <code>sdiff</code></a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">        Side-by-side merge of file differences.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_18.html#Standards-conformance">17. Standards conformance</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top"> Conformance to the <acronym>POSIX</acronym> standard.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_19.html#Projects">18. Future Projects</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">              If you&rsquo;ve found a bug or other shortcoming.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_20.html#Copying-This-Manual">A. Copying This Manual</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">   How to make copies of this manual.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_21.html#Translations">B. Translations of This Manual</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">          Available translations of this manual.
</td></tr>
<tr><td align="left" valign="top"><a href="diffutils_22.html#Index">C. Index</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top"></td></tr>
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