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

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

       apt-cache  [ -hvs ]  [ -o=config string ]  [ -c=file ]	[ add  file...
       ]  [ gencaches ]	 [ showpkg  pkg... ]  [ stats ]	 [ dump ]  [ dumpavail
       ]   [ unmet ]  [ search	regex ]	 [ show	 pkg... ]  [ showpkg  pkg... ]
       [ depends  pkg... ]  [ pkgnames	prefix ]  [ dotty  pkg... ]  [	policy
       pkgs... ]

       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

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

       add    add adds the names package index files to the package cache.

	      gencaches performs the same opration 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  displays	 information  about the packages listed on the
	      command line. Remaining arguments are package names. The	avail‐
	      able  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 depen‐
	      dencies  need  not be.  For instance, apt-cache showpkg libread‐
	      line2 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,
	      ncurses3.0, and ldso must also be installed;  libreadlineg2  and
	      libreadline2-altdev  do  not  have to be installed. For the spe‐
	      cific meaning of the remainder of the output it is best to  con‐
	      sult the apt source code.

       stats  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  correspon‐
		dence 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	 "pro‐
		vide"  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

	      · Single	virtual	 packages  is the number of packages with only
		one package providing a particular virtual package. For	 exam‐
		ple,  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 pack‐
		age  name  as  the  package  name. For instance, in the Debian
		GNU/Linux system, debconf is both an actual package, and  pro‐
		vided 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
		accesssed, or if a package (real or virtual) has been  dropped
		from  the  distribution. Usually they are referenced from Con‐
		flicts 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  distribu‐
		tion  (both  "stable"  and "unstable", for instance), is being
		accessed, this value can be considerably larger than the  num‐
		ber of total package names.

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

       dump   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 suit‐
	      able for use with dpkg(8) and is used by the dselect(8) method.

       unmet  unmet displays a summary of all unmet dependencies in the	 pack‐
	      age cache.

       show   show  performs a function similar to dpkg --print-avail, it dis‐
	      plays the package records for the named packages.

       search search performs a full text  search  on  all  available  package
	      files  for the regex pattern given. It searchs the package names
	      and the descriptions for an occurance of the string  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.

	      Seperate arguments can be used to specified multiple search pat‐
	      terns that are and'd together.

	      depends shows a listing of each dependency a package has and all
	      the possible other packages that can fullfill that dependency.

	      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 extremly quickly. This command is best
	      used with the --generate option.

       dotty  dotty takes a list of packages on the command line  and  gerner‐
	      ates  output  suitable  for  use	by  dotty  from	 the  GraphVis
	      <URL:http://www.research.att.com/sw/tools/graphviz/>    package.
	      The  result  will	 be  a set of nodes and edges representing the
	      relationships between the packages. By default the  given	 pack‐
	      ages  will  trace out all dependent packages which can produce a
	      very large graph.	  This	can  be	 turned	 off  by  setting  the
	      APT::Cache::GivenOnly option.

	      The  resulting  nodes  will have several shapse, normal packages
	      are boxes, pure provides are triangles, mixed provides are  dia‐
	      monds,  hexagons	are missing packages. Orange boxes mean recur‐
	      sion was stopped [leaf packages], blue lines  are	 prre-depends,
	      green lines are conflicts.

	      Caution, dotty cannot graph larger sets of packages.

       policy policy  is ment 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.

       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.


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


	      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 advoid reparsing all of the  package
	      files.  Configuration Item: Dir::Cache::srcpkgcache.


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


	      Print only important  deps;  for	use  with  unmet  causes  only
	      Depends  and Pre-Depends relations to be printed.	 Configuration
	      Item: APT::Cache::Important.


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


	      Print  full  records  for	 all  available versions, this is only
	      applicable   to	the   show   command.	 Configuration	 Item:


	      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.

	      Only  search  on	the  package  names, not the long description.
	      Configuration Item: APT::Cache::NamesOnly.

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

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


       --help Show a short usage summary.


	      Show the program verison.


	      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.


	      Set a Configuration Option; This will set an arbitary configura‐
	      tion 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:

	      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.

       See  the APT bug page <URL:http://bugs.debian.org/apt>.	If you wish to
       report a bug in APT, please see /usr/share/doc/debian/bug-reporting.txt
       or the bug(1) command.

       APT was written by the APT team <apt@packages.debian.org>.

				 12 March 2001			  APT-CACHE(8)

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