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-mailto(apt@packages.debian.org)
-manpage(apt-cache)(8)(4 Dec 1998)(apt)()
-manpagename(apt-cache)(APT package handling utility -- cache manipulator)
-
-manpagesynopsis()
-apt-cache command [argument ...]
-
-manpagedescription()
-bf(apt-cache) performs a variety of operations on APT's package cache.
-bf(apt-cache) is seldom called directly; instead its operations are
-performed automatically by the other bf(apt) utilities.
-
-em(command) is one of:
-itemize(
- it() add file1 [file2] [...]
- it() gencaches
- it() showpkg package1 [package2] [...]
- it() stats
- it() dump
- it() dumpavail
- it() unmet
- it() check
- it() search
- it() show
- it() showpkg
- it() depends
- it() pkgnames
- it() dotty
-)
-
-Unless the -h, or --help option is given one of the above commands
-must be present.
-
-startdit()
-dit(bf(add))
-bf(add) adds the names package index files to the package cache.
-
-dit(bf(gencaches))
-bf(gencaches) performs the same opration as bf(apt-get check). It builds
-the source and package caches from thes sources in bf(/etc/apt/sources.list)
-and from bf(/var/lib/dpkg/status).
-
-dit(bf(showpkg))
-bf(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, bf(apt-cache showpkg libreadline2) would produce output similar
-to the following:
-
-verb(
-Package: libreadline2
-
-Versions:
-
-2.1-12(/var/state/apt/lists/debian.midco.net_debian_dists_slink_main_binary-i386_Packages),
-
-Reverse Depends:
-
- libreadlineg2,libreadline2
-
- libreadline2-altdev,libreadline2
-Dependencies:
-
-2.1-12 - libc5 (2 5.4.0-0) ncurses3.0 (0 (null)) ldso (2 1.9.0-1)
-
-Provides:
-
-2.1-12 -
-
-Reverse Provides:
-)
-
-Thus it may be seen that libreadline2, version 2.1-8, depends on libc5,
-ncurses3.0, and ldso, 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 specific meaning of the remainder of the output it
-is best to consult the apt source code.
-
-dit(bf(stats))
-bf(stats) displays some statistics about bf(cache).
-No further arguments are expected. Statistics reported are:
-itemize(
- it() bf(Total package names) is the number of package names found in the cache.
-
- it() bf(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.
-
- it() bf(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".
-
- it() bf(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 "X11-text-viewer".
-
- it() bf(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, e2fsprogs is
- both an actual package, and provided by the e2compr package.
-
- it() bf(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.
-
- it() bf(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.
-
- it() bf(Total dependencies) is the number of dependency relationships claimed
- by all of the packages in the cache.
-)
-
-dit(bf(dump))
-bf(dump) shows a short listing of every package in the cache. It is primarily
-for debugging.
-
-dit(bf(dumpavail))
-bf(dumpavail) prints out an available list to stdout. This is suitable for use
-with bf(dpkg) and is used by the bf(dselect) method.
-
-dit(bf(unmet))
-bf(unmet) displays a summary of all unmet dependencies in the package cache.
-
-dit(bf(check))
-bf(check) is a random function for testing certain aspects of the cache.
-Do not use it.
-
-dit(bf(showpkg))
-bf(showpkg) displays a listing of the given package cache structure and some
-related information about it. The list is meant primarily for debugging.
-
-dit(bf(show))
-bf(show) performs a function similar to dpkg --print-avail, it displays
-the package records for the named packages.
-
-dit(bf(search))
-bf(search) performs a full text search on all available package files for
-the 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 bf(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.
-
-dit(bf(depends))
-bf(depends) shows a listing of each dependency a package has and all
-the possible other packages that can fullfill that dependency.
-
-dit(bf(pkgnames))
-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 bf(--no-generate) option.
-
-dit(bf(dotty))
-bf(dotty) Takes a list of packages on the command line and gernerates output
-suitable for use by dotty from the GraphVis
-(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 packages 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 diamonds,
-hexagons are missing packages. Orange boxes mean recursion was stopped
-[leaf packages], blue lines are prre-depends, green lines are conflicts.
-
-Caution, dotty cannot graph larger sets of packages.
-
-enddit()
-
-manpageoptions()
-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 bf(-f-),
-bf(--no-f), bf(-f=no) or several other variations.
-
-startdit()
-dit(bf(-h, --help))
-Show a short usage summary.
-
-dit(bf(-v, --version))
-Show the program verison.
-
-dit(bf(-p --pkg-cache))
-Select the file to store the package cache. The package cache is the primary
-cache used by all operations.
-Configuration Item: bf(Dir::Cache::pkgcache).
-
-dit(bf(-s --src-cache))
-Select the file to store the source cache. The source is used only by
-bf(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: bf(Dir::Cache::srcpkgcache).
-
-dit(bf(-q, --quiet))
-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
-bf(-q=#) to set the quiet level, overriding the configuration file.
-Configuration Item: bf(quiet).
-
-dit(bf(-i --important))
-Print only important deps; for use with unmet causes only em(Depends) and
-em(Pre-Depends) relations to be printed.
-Configuration Item: bf(APT::Cache::Important).
-
-dit(bf(-f --full))
-Print full package records when searching. Configuration Item: bf(APT::Cache::ShowFull).
-
-dit(bf(-a --all-versions))
-Print full records for all available versions, this is only applicable to the
-show command. Configuration Item: bf(APT::Cache::AllVersions)
-
-dit(bf(-g --no-generate))
-Do not perform automatic package cache regeneration, use the cache as it is.
-Configuration Item: bf(APT::Cache::NoGenerate).
-
-dit(bf(--names-only))
-Only search on the package names, not the long description.
-Configuration Item: bf(APT::Cache::NamesOnly).
-
-dit(bf(--all-names))
-Make bf(pkgnames) print all names, including virtual packages and missing
-dependencies. Configuration Item: bf(APT::Cache::AllNames).
-
-dit(bf(-c, --config-file))
-Configuration File; Specify a configuration file to use. bf(apt-get) will
-read the default configuration file and then this configuration file. See
-bf(apt.conf(5)) for syntax information.
-
-dit(bf(-o, --option))
-Set a Configuration Option; This will set an arbitary configuration option.
-The syntax is
-verb(-o Foo::Bar=bar)
-enddit()
-
-manpagefiles()
-itemize(
- it() /etc/apt/sources.list
- locations to fetch packages from
-
- it() /var/state/apt/lists/
- storage area for state information for each package resource specified in
-
- it() /var/state/apt/lists/partial/
- storage area for state information in transit
-)
-
-manpageseealso()
-apt-get(8),
-sources.list(5),
-apt.conf(5)
-
-manpagediagnostics()
-apt-cache returns zero on normal operation, decimal 100 on error.
-
-manpagebugs()
-See http://bugs.debian.org/apt. If you wish to report a
-bug in bf(apt-cache), please see bf(/usr/doc/debian/bug-reporting.txt)
-or the bf(bug(1)) command.
-
-manpageauthor()
-apt-get was written by the APT team <apt@packages.debian.org>.