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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>debtree - Package dependency graphs</title>
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<h1>debtree — package dependency graphs on steroids</h1>
<table>
<tbody valign="top">
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<td>
<h3><a href="index.html">Introduction</a></h3>
<h3>Advanced usage examples</h3>
<ol>
<li><a href="usage1.html">Create a build dependency graph</a></li>
<li><a href="usage2.html">Visualize what would happen when installing a package</a></li>
<li><a href="usage3.html">Dependencies on virtual packages</a></li>
<li><b>Reverse dependencies</b></li>
</ol>
<hr />
<p>
A reverse dependency graph shows why a package is installed: what other
packages depend on it.
</p><p>
This graph shows only installed packages (the <tt>-I</tt> option), with
the reverse dependencies in light blue. By default only one level of reverse
dependencies is displayed. In this example three levels are included as a
result of using the option <tt>--rdeps-depth=3</tt>. To show <i>only</i>
reverse dependencies, add the option <tt>--max-depth=0</tt>.
</p><p>
The colors of the arrows have the same meaning as for "forward" dependencies.
The inclusion of Recommends is controlled by the <tt>--no-recommends</tt>
option; displaying reverse dependencies of type Suggests is not supported.
</p><p>
The graph will always include all <i>direct</i> reverse dependencies
(both on the package itself and all virtual packages provided by it).
In the example some packages depend on <tt>apt</tt> itself, and others
on <tt>libapt-pkg-...</tt>.
</p><p>
As shown for <tt>debconf</tt>, the number of <i>indirect</i> reverse
dependencies that gets displayed, is by default limited to five, but that
can be changed by using the option <tt>--max_rdeps=<i>n</i></tt>. When
the individual packages are not shown, the number of packages per type of
dependency is shown next to their arrows.
</p><p>
It is possible to generate graphs that show all reverse dependencies,
both installed and not installed, but be warned that such graphs are
likely to explode in size.
</p><p>
Additional examples can be found in
<a href="http://alioth.debian.org/~fjp/log/posts/debtree-next_-_More_steroids.html">the author's blog</a>.
</p>
</td>
<td width="10" />
<td width="400">
<p><tt><font size="-1">
$ debtree -I --rdeps-depth=3 apt
</font></tt></p>
<hr />
<img src="thumbs/usage4.png" alt="Dependency graph for pidentd" />
<hr />
<table>
<tr>
<td>Generated .dot file:</td>
<td><a href="usage4.dot">DOT</a></td>
</tr><tr>
<td>Full-sized images:</td>
<td><a href="usage4.ps" target="_blank">PS</a> | PNG | <a href="usage4.svg" target="_blank">SVG</a></td>
</tr>
</table>
</td>
</tr>
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</table>
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