apt

APT tools

コマンド	概要
apt-config	is an internal program used by various portions of the APT suite to provide consistent configurability. It accesses the main configuration file /etc/apt/apt.conf in a manner that is easy to use for scripted applications.
apt-cache	performs a variety of operations on APT's package cache. apt-cache does not manipulate the state of the system but does provide operations to search and generate interesting output from the package metadata. The metadata is acquired and updated via the 'update' command of e.g. apt-get, so that it can be outdated if the last update is too long ago, but in exchange apt-cache works independently of the availability of the configured sources (e.g. offline).
apt-cdrom	is used to add a new CD-ROM to APT's list of available sources. apt-cdrom takes care of determining the structure of the disc as well as correcting for several possible mis-burns and verifying the index files.