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APT-CACHE(8)							  APT-CACHE(8)

       apt-cache - APT package handling utility -- cache manipulator

       apt-cache [-hvsn] [-o=config string] [-c=file] {[add file...] |
		 [gencaches] | [showpkg pkg...] | [showsrc pkg...] | [stats] |
		 [dump] | [dumpavail] | [unmet] | [search regex] |
		 [show pkg...] | [depends pkg...] | [rdepends pkg...] |
		 [pkgnames prefix] | [dotty pkg...] | [policy pkgs...] |
		 [madison pkgs...]}

       apt-cache performs a variety of operations on APTs 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

       Unless the -h, or --help option is given, one of the commands below
       must be present.

       add file(s)
	  add adds the named package index files to the package cache. This is
	  for debugging only.

	  gencaches performs the same operation as apt-get check. It builds
	  the source and package caches from the sources in sources.list(5)
	  and from /var/lib/dpkg/status.

       showpkg pkg(s)
	  showpkg displays information about the packages listed on the
	  command line. Remaining arguments are package names. The available
	  versions and reverse dependencies of each package listed are listed,
	  as well as forward dependencies for each version. Forward (normal)
	  dependencies are those packages upon which the package in question
	  depends; reverse dependencies are those packages that depend upon
	  the package in question. Thus, forward dependencies must be
	  satisfied for a package, but reverse dependencies need not be. For
	  instance, apt-cache showpkg libreadline2 would produce output
	  similar to the following:

	     Package: libreadline2
	     Versions: 2.1-12(/var/state/apt/lists/foo_Packages),
	     Reverse Depends:
	     2.1-12 - libc5 (2 5.4.0-0) ncurses3.0 (0 (null))
	     2.1-12 -
	     Reverse Provides:
	  Thus it may be seen that libreadline2, version 2.1-12, depends on
	  libc5 and ncurses3.0 which must be installed for libreadline2 to
	  work. In turn, libreadlineg2 and libreadline2-altdev depend on
	  libreadline2. If libreadline2 is installed, libc5 and ncurses3.0
	  (and ldso) must also be installed; libreadlineg2 and
	  libreadline2-altdev do not have to be installed. For the specific
	  meaning of the remainder of the output it is best to consult the apt
	  source code.

	  stats displays some statistics about the cache. No further arguments
	  are expected. Statistics reported are:

	       Total package names is the number of package names found in
		the cache.

	       Normal packages is the number of regular, ordinary package
		names; these are packages that bear a one-to-one
		correspondence between their names and the names used by other
		packages for them in dependencies. The majority of packages
		fall into this category.

	       Pure virtual packages is the number of packages that exist
		only as a virtual package name; that is, packages only
		"provide" the virtual package name, and no package actually
		uses the name. For instance, "mail-transport-agent" in the
		Debian GNU/Linux system is a pure virtual package; several
		packages provide "mail-transport-agent", but there is no
		package named "mail-transport-agent".

	       Single virtual packages is the number of packages with only
		one package providing a particular virtual package. For
		example, in the Debian GNU/Linux system, "X11-text-viewer" is
		a virtual package, but only one package, xless, provides

	       Mixed virtual packages is the number of packages that either
		provide a particular virtual package or have the virtual
		package name as the package name. For instance, in the Debian
		GNU/Linux system, "debconf" is both an actual package, and
		provided by the debconf-tiny package.

	       Missing is the number of package names that were referenced in
		a dependency but were not provided by any package. Missing
		packages may be in evidence if a full distribution is not
		accessed, or if a package (real or virtual) has been dropped
		from the distribution. Usually they are referenced from
		Conflicts statements.

	       Total distinct versions is the number of package versions
		found in the cache; this value is therefore at least equal to
		the number of total package names. If more than one
		distribution (both "stable" and "unstable", for instance), is
		being accessed, this value can be considerably larger than the
		number of total package names.

	       Total dependencies is the number of dependency relationships
		claimed by all of the packages in the cache.

       showsrc pkg(s)
	  showsrc displays all the source package records that match the given
	  package names. All versions are shown, as well as all records that
	  declare the name to be a Binary.

	  dump shows a short listing of every package in the cache. It is
	  primarily for debugging.

	  dumpavail prints out an available list to stdout. This is suitable
	  for use with dpkg(8) and is used by the dselect(8) method.

	  unmet displays a summary of all unmet dependencies in the package

       show pkg(s)
	  show performs a function similar to dpkg --print-avail; it displays
	  the package records for the named packages.

       search regex [ regex ... ]
	  search performs a full text search on all available package lists
	  for the regex pattern given. It searches the package names and the
	  descriptions for an occurrence of the regular expression and prints
	  out the package name and the short description. If --full is given
	  then output identical to show is produced for each matched package,
	  and if --names-only is given then the long description is not
	  searched, only the package name is.

	  Separate arguments can be used to specify multiple search patterns
	  that are anded together.

       depends pkg(s)
	  depends shows a listing of each dependency a package has and all the
	  possible other packages that can fulfill that dependency.

       rdepends pkg(s)
	  rdepends shows a listing of each reverse dependency a package has.

       pkgnames [ prefix ]
	  This command prints the name of each package in the system. The
	  optional argument is a prefix match to filter the name list. The
	  output is suitable for use in a shell tab complete function and the
	  output is generated extremely quickly. This command is best used
	  with the --generate option.

       dotty pkg(s)
	  dotty takes a list of packages on the command line and generates
	  output suitable for use by dotty from the [1]GraphViz package. The
	  result will be a set of nodes and edges representing the
	  relationships between the packages. By default the given packages
	  will trace out all dependent packages; this can produce a very large
	  graph. To limit the output to only the packages listed on the
	  command line, set the APT::Cache::GivenOnly option.

	  The resulting nodes will have several shapes; normal packages are
	  boxes, pure provides are triangles, mixed provides are diamonds,
	  missing packages are hexagons. Orange boxes mean recursion was
	  stopped [leaf packages], blue lines are pre-depends, green lines are

	  Caution, dotty cannot graph larger sets of packages.

       policy [ pkg(s) ]
	  policy is meant to help debug issues relating to the preferences
	  file. With no arguments it will print out the priorities of each
	  source. Otherwise it prints out detailed information about the
	  priority selection of the named package.

       madison /[ pkg(s) ]
	  apt-caches madison command attempts to mimic the output format and
	  a subset of the functionality of the Debian archive management tool,
	  madison. It displays available versions of a package in a tabular
	  format. Unlike the original madison, it can only display information
	  for the architecture for which APT has retrieved package lists

       All command line options may be set using the configuration file, the
       descriptions indicate the configuration option to set. For boolean
       options you can override the config file by using something like
       -f-,--no-f, -f=no or several other variations.

       -p, --pkg-cache
	  Select the file to store the package cache. The package cache is the
	  primary cache used by all operations. Configuration Item:

       -s, --src-cache
	  Select the file to store the source cache. The source is used only
	  by gencaches and it stores a parsed version of the package
	  information from remote sources. When building the package cache the
	  source cache is used to avoid reparsing all of the package files.
	  Configuration Item: Dir::Cache::srcpkgcache.

       -q, --quiet
	  Quiet; produces output suitable for logging, omitting progress
	  indicators. More qs will produce more quietness up to a maximum of
	  2. You can also use -q=# to set the quietness level, overriding the
	  configuration file. Configuration Item: quiet.

       -i, --important
	  Print only important dependencies; for use with unmet. Causes only
	  Depends and Pre-Depends relations to be printed. Configuration Item:

       -f, --full
	  Print full package records when searching. Configuration Item:

       -a, --all-versions
	  Print full records for all available versions. This is the default;
	  to turn it off, use --no-all-versions. If --no-all-versions is
	  specified, only the candidate version will displayed (the one which
	  would be selected for installation). This option is only applicable
	  to the show command. Configuration Item: APT::Cache::AllVersions.

       -g, --generate
	  Perform automatic package cache regeneration, rather than use the
	  cache as it is. This is the default; to turn it off, use
	  --no-generate. Configuration Item: APT::Cache::Generate.

       --names-only, -n
	  Only search on the package names, not the long descriptions.
	  Configuration Item: APT::Cache::NamesOnly.

	  Make pkgnames print all names, including virtual packages and
	  missing dependencies. Configuration Item: APT::Cache::AllNames.

	  Make depends and rdepends recursive so that all packages mentioned
	  are printed once. Configuration Item: APT::Cache::RecurseDepends.

	  Limit the output of depends and rdepends to packages which are
	  currently installed. Configuration Item: APT::Cache::Installed.

       -h, --help
	  Show a short usage summary.

       -v, --version
	  Show the program version.

       -c, --config-file
	  Configuration File; Specify a configuration file to use. The program
	  will read the default configuration file and then this configuration
	  file. See apt.conf(5) for syntax information.

       -o, --option
	  Set a Configuration Option; This will set an arbitary configuration
	  option. The syntax is -o Foo::Bar=bar.

	  Locations to fetch packages from. Configuration Item:

	  Storage area for state information for each package resource
	  specified in sources.list(5) Configuration Item: Dir::State::Lists.

	  Storage area for state information in transit. Configuration Item:
	  Dir::State::Lists (implicit partial).

       apt.conf(5), sources.list(5), apt-get(8)

       apt-cache returns zero on normal operation, decimal 100 on error.

       [2]APT bug page. If you wish to report a bug in APT, please see
       /usr/share/doc/debian/bug-reporting.txt or the reportbug(1) command.

       Jason Gunthorpe

       APT team

       1. GraphViz

       2. APT bug page

Linux			       29 February 2004 		  APT-CACHE(8)

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