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<h1 class="title"><a id="ch1"/>Chapter 1. Introduction</h1>
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<strong>Table of Contents</strong>
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<a href="ch1.html#s1.1">1.1. General</a>
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<h2 class="title"><a id="s1.1"/>1.1. General</h2>
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<p>
This document serves two purposes. The first is to document the installed
directory structure and the format and purpose of each file. The second
purpose is to document how APT views the Debian archive and deals with multiple
package files.
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The var directory structure is as follows:
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<pre class="screen">
/var/lib/apt/
lists/
partial/
periodic/
extended_states
cdroms.list
/var/cache/apt/
archives/
partial/
pkgcache.bin
srcpkgcache.bin
/etc/apt/
sources.list.d/
apt.conf.d/
preferences.d/
trusted.gpg.d/
sources.list
apt.conf
apt_preferences
trusted.gpg
/usr/lib/apt/
methods/
bzip2
cdrom
copy
file
ftp
gpgv
gzip
http
https
lzma
rred
rsh
ssh
</pre>
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As is specified in the FHS 2.1 /var/lib/apt is used for application data that
is not expected to be user modified. /var/cache/apt is used for regeneratable
data and is where the package cache and downloaded .debs go. /etc/apt is the
place where configuration should happen and /usr/lib/apt is the place where the
apt and other packages can place binaries which can be used by the acquire
system of APT.
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