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APT Files
Chapter 1 - Introduction

1.1 General

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.

The var directory structure is as follows:

       /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

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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APT Files