cpanpm
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资源说明:CPAN.pm
NAME
    CPAN - query, download and build perl modules from CPAN sites

SYNOPSIS
    Interactive mode:

      perl -MCPAN -e shell

    --or--

      cpan

    Basic commands:

      # Modules:

      cpan> install Acme::Meta                       # in the shell

      CPAN::Shell->install("Acme::Meta");            # in perl

      # Distributions:

      cpan> install NWCLARK/Acme-Meta-0.02.tar.gz    # in the shell

      CPAN::Shell->
        install("NWCLARK/Acme-Meta-0.02.tar.gz");    # in perl

      # module objects:

      $mo = CPAN::Shell->expandany($mod);
      $mo = CPAN::Shell->expand("Module",$mod);      # same thing

      # distribution objects:

      $do = CPAN::Shell->expand("Module",$mod)->distribution;
      $do = CPAN::Shell->expandany($distro);         # same thing
      $do = CPAN::Shell->expand("Distribution",
                                $distro);            # same thing

DESCRIPTION
    The CPAN module automates or at least simplifies the make and install of
    perl modules and extensions. It includes some primitive searching
    capabilities and knows how to use LWP, HTTP::Tiny, Net::FTP and certain
    external download clients to fetch distributions from the net.

    These are fetched from one or more mirrored CPAN (Comprehensive Perl
    Archive Network) sites and unpacked in a dedicated directory.

    The CPAN module also supports named and versioned *bundles* of modules.
    Bundles simplify handling of sets of related modules. See Bundles below.

    The package contains a session manager and a cache manager. The session
    manager keeps track of what has been fetched, built, and installed in
    the current session. The cache manager keeps track of the disk space
    occupied by the make processes and deletes excess space using a simple
    FIFO mechanism.

    All methods provided are accessible in a programmer style and in an
    interactive shell style.

  CPAN::shell([$prompt, $command]) Starting Interactive Mode
    Enter interactive mode by running

        perl -MCPAN -e shell

    or

        cpan

    which puts you into a readline interface. If "Term::ReadKey" and either
    of "Term::ReadLine::Perl" or "Term::ReadLine::Gnu" are installed,
    history and command completion are supported.

    Once at the command line, type "h" for one-page help screen; the rest
    should be self-explanatory.

    The function call "shell" takes two optional arguments: one the prompt,
    the second the default initial command line (the latter only works if a
    real ReadLine interface module is installed).

    The most common uses of the interactive modes are

    Searching for authors, bundles, distribution files and modules
      There are corresponding one-letter commands "a", "b", "d", and "m" for
      each of the four categories and another, "i" for any of the mentioned
      four. Each of the four entities is implemented as a class with
      slightly differing methods for displaying an object.

      Arguments to these commands are either strings exactly matching the
      identification string of an object, or regular expressions matched
      case-insensitively against various attributes of the objects. The
      parser only recognizes a regular expression when you enclose it with
      slashes.

      The principle is that the number of objects found influences how an
      item is displayed. If the search finds one item, the result is
      displayed with the rather verbose method "as_string", but if more than
      one is found, each object is displayed with the terse method
      "as_glimpse".

      Examples:

        cpan> m Acme::MetaSyntactic
        Module id = Acme::MetaSyntactic
            CPAN_USERID  BOOK (Philippe Bruhat (BooK) <[...]>)
            CPAN_VERSION 0.99
            CPAN_FILE    B/BO/BOOK/Acme-MetaSyntactic-0.99.tar.gz
            UPLOAD_DATE  2006-11-06
            MANPAGE      Acme::MetaSyntactic - Themed metasyntactic variables names
            INST_FILE    /usr/local/lib/perl/5.10.0/Acme/MetaSyntactic.pm
            INST_VERSION 0.99
        cpan> a BOOK
        Author id = BOOK
            EMAIL        [...]
            FULLNAME     Philippe Bruhat (BooK)
        cpan> d BOOK/Acme-MetaSyntactic-0.99.tar.gz
        Distribution id = B/BO/BOOK/Acme-MetaSyntactic-0.99.tar.gz
            CPAN_USERID  BOOK (Philippe Bruhat (BooK) <[...]>)
            CONTAINSMODS Acme::MetaSyntactic Acme::MetaSyntactic::Alias [...]
            UPLOAD_DATE  2006-11-06
        cpan> m /lorem/
        Module  = Acme::MetaSyntactic::loremipsum (BOOK/Acme-MetaSyntactic-0.99.tar.gz)
        Module    Text::Lorem            (ADEOLA/Text-Lorem-0.3.tar.gz)
        Module    Text::Lorem::More      (RKRIMEN/Text-Lorem-More-0.12.tar.gz)
        Module    Text::Lorem::More::Source (RKRIMEN/Text-Lorem-More-0.12.tar.gz)
        cpan> i /berlin/
        Distribution    BEATNIK/Filter-NumberLines-0.02.tar.gz
        Module  = DateTime::TimeZone::Europe::Berlin (DROLSKY/DateTime-TimeZone-0.7904.tar.gz)
        Module    Filter::NumberLines    (BEATNIK/Filter-NumberLines-0.02.tar.gz)
        Author          [...]

      The examples illustrate several aspects: the first three queries
      target modules, authors, or distros directly and yield exactly one
      result. The last two use regular expressions and yield several
      results. The last one targets all of bundles, modules, authors, and
      distros simultaneously. When more than one result is available, they
      are printed in one-line format.

    "get", "make", "test", "install", "clean" modules or distributions
      These commands take any number of arguments and investigate what is
      necessary to perform the action. Argument processing is as follows:

        known module name in format Foo/Bar.pm   module
        other embedded slash                     distribution
          - with trailing slash dot              directory
        enclosing slashes                        regexp
        known module name in format Foo::Bar     module

      If the argument is a distribution file name (recognized by embedded
      slashes), it is processed. If it is a module, CPAN determines the
      distribution file in which this module is included and processes that,
      following any dependencies named in the module's META.yml or
      Makefile.PL (this behavior is controlled by the configuration
      parameter "prerequisites_policy"). If an argument is enclosed in
      slashes it is treated as a regular expression: it is expanded and if
      the result is a single object (distribution, bundle or module), this
      object is processed.

      Example:

          install Dummy::Perl                   # installs the module
          install AUXXX/Dummy-Perl-3.14.tar.gz  # installs that distribution
          install /Dummy-Perl-3.14/             # same if the regexp is unambiguous

      "get" downloads a distribution file and untars or unzips it, "make"
      builds it, "test" runs the test suite, and "install" installs it.

      Any "make" or "test" is run unconditionally. An

        install 

      is also run unconditionally. But for

        install 

      CPAN checks whether an install is needed and prints *module up to
      date* if the distribution file containing the module doesn't need
      updating.

      CPAN also keeps track of what it has done within the current session
      and doesn't try to build a package a second time regardless of whether
      it succeeded or not. It does not repeat a test run if the test has
      been run successfully before. Same for install runs.

      The "force" pragma may precede another command (currently: "get",
      "make", "test", or "install") to execute the command from scratch and
      attempt to continue past certain errors. See the section below on the
      "force" and the "fforce" pragma.

      The "notest" pragma skips the test part in the build process.

      Example:

          cpan> notest install Tk

      A "clean" command results in a

        make clean

      being executed within the distribution file's working directory.

    "readme", "perldoc", "look" module or distribution
      "readme" displays the README file of the associated distribution.
      "Look" gets and untars (if not yet done) the distribution file,
      changes to the appropriate directory and opens a subshell process in
      that directory. "perldoc" displays the module's pod documentation in
      html or plain text format.

    "ls" author
    "ls" globbing_expression
      The first form lists all distribution files in and below an author's
      CPAN directory as stored in the CHECKSUMS files distributed on CPAN.
      The listing recurses into subdirectories.

      The second form limits or expands the output with shell globbing as in
      the following examples:

            ls JV/make*
            ls GSAR/*make*
            ls */*make*

      The last example is very slow and outputs extra progress indicators
      that break the alignment of the result.

      Note that globbing only lists directories explicitly asked for, for
      example FOO/* will not list FOO/bar/Acme-Sthg-n.nn.tar.gz. This may be
      regarded as a bug that may be changed in some future version.

    "failed"
      The "failed" command reports all distributions that failed on one of
      "make", "test" or "install" for some reason in the currently running
      shell session.

    Persistence between sessions
      If the "YAML" or the "YAML::Syck" module is installed a record of the
      internal state of all modules is written to disk after each step. The
      files contain a signature of the currently running perl version for
      later perusal.

      If the configurations variable "build_dir_reuse" is set to a true
      value, then CPAN.pm reads the collected YAML files. If the stored
      signature matches the currently running perl, the stored state is
      loaded into memory such that persistence between sessions is
      effectively established.

    The "force" and the "fforce" pragma
      To speed things up in complex installation scenarios, CPAN.pm keeps
      track of what it has already done and refuses to do some things a
      second time. A "get", a "make", and an "install" are not repeated. A
      "test" is repeated only if the previous test was unsuccessful. The
      diagnostic message when CPAN.pm refuses to do something a second time
      is one of *Has already been *"unwrapped|made|tested successfully" or
      something similar. Another situation where CPAN refuses to act is an
      "install" if the corresponding "test" was not successful.

      In all these cases, the user can override this stubborn behaviour by
      prepending the command with the word force, for example:

        cpan> force get Foo
        cpan> force make AUTHOR/Bar-3.14.tar.gz
        cpan> force test Baz
        cpan> force install Acme::Meta

      Each *forced* command is executed with the corresponding part of its
      memory erased.

      The "fforce" pragma is a variant that emulates a "force get" which
      erases the entire memory followed by the action specified, effectively
      restarting the whole get/make/test/install procedure from scratch.

    Lockfile
      Interactive sessions maintain a lockfile, by default "~/.cpan/.lock".
      Batch jobs can run without a lockfile and not disturb each other.

      The shell offers to run in *downgraded mode* when another process is
      holding the lockfile. This is an experimental feature that is not yet
      tested very well. This second shell then does not write the history
      file, does not use the metadata file, and has a different prompt.

    Signals
      CPAN.pm installs signal handlers for SIGINT and SIGTERM. While you are
      in the cpan-shell, it is intended that you can press "^C" anytime and
      return to the cpan-shell prompt. A SIGTERM will cause the cpan-shell
      to clean up and leave the shell loop. You can emulate the effect of a
      SIGTERM by sending two consecutive SIGINTs, which usually means by
      pressing "^C" twice.

      CPAN.pm ignores SIGPIPE. If the user sets "inactivity_timeout", a
      SIGALRM is used during the run of the "perl Makefile.PL" or "perl
      Build.PL" subprocess. A SIGALRM is also used during module version
      parsing, and is controlled by "version_timeout".

  CPAN::Shell
    The commands available in the shell interface are methods in the package
    CPAN::Shell. If you enter the shell command, your input is split by the
    Text::ParseWords::shellwords() routine, which acts like most shells do.
    The first word is interpreted as the method to be invoked, and the rest
    of the words are treated as the method's arguments. Continuation lines
    are supported by ending a line with a literal backslash.

  autobundle
    "autobundle" writes a bundle file into the
    "$CPAN::Config->{cpan_home}/Bundle" directory. The file contains a list
    of all modules that are both available from CPAN and currently installed
    within @INC. Duplicates of each distribution are suppressed. The name of
    the bundle file is based on the current date and a counter, e.g.
    Bundle/Snapshot_2012_05_21_00.pm. This is installed again by running
    "cpan Bundle::Snapshot_2012_05_21_00", or installing
    "Bundle::Snapshot_2012_05_21_00" from the CPAN shell.

    Return value: path to the written file.

  hosts
    Note: this feature is still in alpha state and may change in future
    versions of CPAN.pm

    This commands provides a statistical overview over recent download
    activities. The data for this is collected in the YAML file
    "FTPstats.yml" in your "cpan_home" directory. If no YAML module is
    configured or YAML not installed, no stats are provided.

    install_tested
        Install all distributions that have been tested successfully but
        have not yet been installed. See also "is_tested".

    is_tested
        List all build directories of distributions that have been tested
        successfully but have not yet been installed. See also
        "install_tested".

  mkmyconfig
    mkmyconfig() writes your own CPAN::MyConfig file into your "~/.cpan/"
    directory so that you can save your own preferences instead of the
    system-wide ones.

  r [Module|/Regexp/]...
    scans current perl installation for modules that have a newer version
    available on CPAN and provides a list of them. If called without
    argument, all potential upgrades are listed; if called with arguments
    the list is filtered to the modules and regexps given as arguments.

    The listing looks something like this:

      Package namespace         installed    latest  in CPAN file
      CPAN                        1.94_64    1.9600  ANDK/CPAN-1.9600.tar.gz
      CPAN::Reporter               1.1801    1.1902  DAGOLDEN/CPAN-Reporter-1.1902.tar.gz
      YAML                           0.70      0.73  INGY/YAML-0.73.tar.gz
      YAML::Syck                     1.14      1.17  AVAR/YAML-Syck-1.17.tar.gz
      YAML::Tiny                     1.44      1.50  ADAMK/YAML-Tiny-1.50.tar.gz
      CGI                            3.43      3.55  MARKSTOS/CGI.pm-3.55.tar.gz
      Module::Build::YAML            1.40      1.41  DAGOLDEN/Module-Build-0.3800.tar.gz
      TAP::Parser::Result::YAML      3.22      3.23  ANDYA/Test-Harness-3.23.tar.gz
      YAML::XS                       0.34      0.35  INGY/YAML-LibYAML-0.35.tar.gz

    It suppresses duplicates in the column "in CPAN file" such that
    distributions with many upgradeable modules are listed only once.

    Note that the list is not sorted.

  recent ***EXPERIMENTAL COMMAND***
    The "recent" command downloads a list of recent uploads to CPAN and
    displays them *slowly*. While the command is running, a $SIG{INT} exits
    the loop after displaying the current item.

    Note: This command requires XML::LibXML installed.

    Note: This whole command currently is just a hack and will probably
    change in future versions of CPAN.pm, but the general approach will
    likely remain.

    Note: See also smoke

  recompile
    recompile() is a special command that takes no argument and runs the
    make/test/install cycle with brute force over all installed dynamically
    loadable extensions (a.k.a. XS modules) with 'force' in effect. The
    primary purpose of this command is to finish a network installation.
    Imagine you have a common source tree for two different architectures.
    You decide to do a completely independent fresh installation. You start
    on one architecture with the help of a Bundle file produced earlier.
    CPAN installs the whole Bundle for you, but when you try to repeat the
    job on the second architecture, CPAN responds with a "Foo up to date"
    message for all modules. So you invoke CPAN's recompile on the second
    architecture and you're done.

    Another popular use for "recompile" is to act as a rescue in case your
    perl breaks binary compatibility. If one of the modules that CPAN uses
    is in turn depending on binary compatibility (so you cannot run CPAN
    commands), then you should try the CPAN::Nox module for recovery.

  report Bundle|Distribution|Module
    The "report" command temporarily turns on the "test_report" config
    variable, then runs the "force test" command with the given arguments.
    The "force" pragma reruns the tests and repeats every step that might
    have failed before.

  smoke ***EXPERIMENTAL COMMAND***
    *** WARNING: this command downloads and executes software from CPAN to
    your computer of completely unknown status. You should never do this
    with your normal account and better have a dedicated well separated and
    secured machine to do this. ***

    The "smoke" command takes the list of recent uploads to CPAN as provided
    by the "recent" command and tests them all. While the command is running
    $SIG{INT} is defined to mean that the current item shall be skipped.

    Note: This whole command currently is just a hack and will probably
    change in future versions of CPAN.pm, but the general approach will
    likely remain.

    Note: See also recent

  upgrade [Module|/Regexp/]...
    The "upgrade" command first runs an "r" command with the given arguments
    and then installs the newest versions of all modules that were listed by
    that.

  The four "CPAN::*" Classes: Author, Bundle, Module, Distribution
    Although it may be considered internal, the class hierarchy does matter
    for both users and programmer. CPAN.pm deals with the four classes
    mentioned above, and those classes all share a set of methods. Classical
    single polymorphism is in effect. A metaclass object registers all
    objects of all kinds and indexes them with a string. The strings
    referencing objects have a separated namespace (well, not completely
    separated):

             Namespace                         Class

       words containing a "/" (slash)      Distribution
        words starting with Bundle::          Bundle
              everything else            Module or Author

    Modules know their associated Distribution objects. They always refer to
    the most recent official release. Developers may mark their releases as
    unstable development versions (by inserting an underscore into the
    module version number which will also be reflected in the distribution
    name when you run 'make dist'), so the really hottest and newest
    distribution is not always the default. If a module Foo circulates on
    CPAN in both version 1.23 and 1.23_90, CPAN.pm offers a convenient way
    to install version 1.23 by saying

        install Foo

    This would install the complete distribution file (say
    BAR/Foo-1.23.tar.gz) with all accompanying material. But if you would
    like to install version 1.23_90, you need to know where the distribution
    file resides on CPAN relative to the authors/id/ directory. If the
    author is BAR, this might be BAR/Foo-1.23_90.tar.gz; so you would have
    to say

        install BAR/Foo-1.23_90.tar.gz

    The first example will be driven by an object of the class CPAN::Module,
    the second by an object of class CPAN::Distribution.

  Integrating local directories
    Note: this feature is still in alpha state and may change in future
    versions of CPAN.pm

    Distribution objects are normally distributions from the CPAN, but there
    is a slightly degenerate case for Distribution objects, too, of projects
    held on the local disk. These distribution objects have the same name as
    the local directory and end with a dot. A dot by itself is also allowed
    for the current directory at the time CPAN.pm was used. All actions such
    as "make", "test", and "install" are applied directly to that directory.
    This gives the command "cpan ." an interesting touch: while the normal
    mantra of installing a CPAN module without CPAN.pm is one of

        perl Makefile.PL                 perl Build.PL
               ( go and get prerequisites )
        make                             ./Build
        make test                        ./Build test
        make install                     ./Build install

    the command "cpan ." does all of this at once. It figures out which of
    the two mantras is appropriate, fetches and installs all prerequisites,
    takes care of them recursively, and finally finishes the installation of
    the module in the current directory, be it a CPAN module or not.

    The typical usage case is for private modules or working copies of
    projects from remote repositories on the local disk.

  Redirection
    The usual shell redirection symbols " | " and ">" are recognized by the
    cpan shell only when surrounded by whitespace. So piping to pager or
    redirecting output into a file works somewhat as in a normal shell, with
    the stipulation that you must type extra spaces.

  Plugin support ***EXPERIMENTAL***
    Plugins are objects that implement any of currently eight methods:

      pre_get
      post_get
      pre_make
      post_make
      pre_test
      post_test
      pre_install
      post_install

    The "plugin_list" configuration parameter holds a list of strings of the
    form

      Modulename=arg0,arg1,arg2,arg3,...

    eg:

      CPAN::Plugin::Flurb=dir,/opt/pkgs/flurb/raw,verbose,1

    At run time, each listed plugin is instantiated as a singleton object by
    running the equivalent of this pseudo code:

      my $plugin = ;
      ;
      my $p = $instance{$plugin} ||= Modulename->new($arg0,$arg1,...);

    The generated singletons are kept around from instantiation until the
    end of the shell session.  can be reconfigured at any time
    at run time. While the cpan shell is running, it checks all activated
    plugins at each of the 8 reference points listed above and runs the
    respective method if it is implemented for that object. The method is
    called with the active CPAN::Distribution object passed in as an
    argument.

CONFIGURATION
    When the CPAN module is used for the first time, a configuration
    dialogue tries to determine a couple of site specific options. The
    result of the dialog is stored in a hash reference $CPAN::Config in a
    file CPAN/Config.pm.

    Default values defined in the CPAN/Config.pm file can be overridden in a
    user specific file: CPAN/MyConfig.pm. Such a file is best placed in
    "$HOME/.cpan/CPAN/MyConfig.pm", because "$HOME/.cpan" is added to the
    search path of the CPAN module before the use() or require() statements.
    The mkmyconfig command writes this file for you.

    The "o conf" command has various bells and whistles:

    completion support
        If you have a ReadLine module installed, you can hit TAB at any
        point of the commandline and "o conf" will offer you completion for
        the built-in subcommands and/or config variable names.

    displaying some help: o conf help
        Displays a short help

    displaying current values: o conf [KEY]
        Displays the current value(s) for this config variable. Without KEY,
        displays all subcommands and config variables.

        Example:

          o conf shell

        If KEY starts and ends with a slash, the string in between is
        treated as a regular expression and only keys matching this regexp
        are displayed

        Example:

          o conf /color/

    changing of scalar values: o conf KEY VALUE
        Sets the config variable KEY to VALUE. The empty string can be
        specified as usual in shells, with '' or ""

        Example:

          o conf wget /usr/bin/wget

    changing of list values: o conf KEY SHIFT|UNSHIFT|PUSH|POP|SPLICE|LIST
        If a config variable name ends with "list", it is a list. "o conf
        KEY shift" removes the first element of the list, "o conf KEY pop"
        removes the last element of the list. "o conf KEYS unshift LIST"
        prepends a list of values to the list, "o conf KEYS push LIST"
        appends a list of valued to the list.

        Likewise, "o conf KEY splice LIST" passes the LIST to the
        corresponding splice command.

        Finally, any other list of arguments is taken as a new list value
        for the KEY variable discarding the previous value.

        Examples:

          o conf urllist unshift http://cpan.dev.local/CPAN
          o conf urllist splice 3 1
          o conf urllist http://cpan1.local http://cpan2.local ftp://ftp.perl.org

    reverting to saved: o conf defaults
        Reverts all config variables to the state in the saved config file.

    saving the config: o conf commit
        Saves all config variables to the current config file
        (CPAN/Config.pm or CPAN/MyConfig.pm that was loaded at start).

    The configuration dialog can be started any time later again by issuing
    the command " o conf init " in the CPAN shell. A subset of the
    configuration dialog can be run by issuing "o conf init WORD" where WORD
    is any valid config variable or a regular expression.

  Config Variables
    The following keys in the hash reference $CPAN::Config are currently
    defined:

      allow_installing_module_downgrades
                         allow or disallow installing module downgrades
      allow_installing_outdated_dists
                         allow or disallow installing modules that are
                         indexed in the cpan index pointing to a distro
                         with a higher distro-version number
      applypatch         path to external prg
      auto_commit        commit all changes to config variables to disk
      build_cache        size of cache for directories to build modules
      build_dir          locally accessible directory to build modules
      build_dir_reuse    boolean if distros in build_dir are persistent
      build_requires_install_policy
                         to install or not to install when a module is
                         only needed for building. yes|no|ask/yes|ask/no
      bzip2              path to external prg
      cache_metadata     use serializer to cache metadata
      check_sigs         if signatures should be verified
      cleanup_after_install
                         remove build directory immediately after a
                         successful install and remember that for the
                         duration of the session
      colorize_debug     Term::ANSIColor attributes for debugging output
      colorize_output    boolean if Term::ANSIColor should colorize output
      colorize_print     Term::ANSIColor attributes for normal output
      colorize_warn      Term::ANSIColor attributes for warnings
      commandnumber_in_prompt
                         boolean if you want to see current command number
      commands_quote     preferred character to use for quoting external
                         commands when running them. Defaults to double
                         quote on Windows, single tick everywhere else;
                         can be set to space to disable quoting
      connect_to_internet_ok
                         whether to ask if opening a connection is ok before
                         urllist is specified
      cpan_home          local directory reserved for this package
      curl               path to external prg
      dontload_hash      DEPRECATED
      dontload_list      arrayref: modules in the list will not be
                         loaded by the CPAN::has_inst() routine
      ftp                path to external prg
      ftp_passive        if set, the environment variable FTP_PASSIVE is set
                         for downloads
      ftp_proxy          proxy host for ftp requests
      ftpstats_period    max number of days to keep download statistics
      ftpstats_size      max number of items to keep in the download statistics
      getcwd             see below
      gpg                path to external prg
      gzip               location of external program gzip
      halt_on_failure    stop processing after the first failure of queued
                         items or dependencies
      histfile           file to maintain history between sessions
      histsize           maximum number of lines to keep in histfile
      http_proxy         proxy host for http requests
      inactivity_timeout breaks interactive Makefile.PLs or Build.PLs
                         after this many seconds inactivity. Set to 0 to
                         disable timeouts.
      index_expire       refetch index files after this many days
      inhibit_startup_message
                         if true, suppress the startup message
      keep_source_where  directory in which to keep the source (if we do)
      load_module_verbosity
                         report loading of optional modules used by CPAN.pm
      lynx               path to external prg
      make               location of external make program
      make_arg           arguments that should always be passed to 'make'
      make_install_make_command
                         the make command for running 'make install', for
                         example 'sudo make'
      make_install_arg   same as make_arg for 'make install'
      makepl_arg         arguments passed to 'perl Makefile.PL'
      mbuild_arg         arguments passed to './Build'
      mbuild_install_arg arguments passed to './Build install'
      mbuild_install_build_command
                         command to use instead of './Build' when we are
                         in the install stage, for example 'sudo ./Build'
      mbuildpl_arg       arguments passed to 'perl Build.PL'
      ncftp              path to external prg
      ncftpget           path to external prg
      no_proxy           don't proxy to these hosts/domains (comma separated list)
      pager              location of external program more (or any pager)
      password           your password if you CPAN server wants one
      patch              path to external prg
      patches_dir        local directory containing patch files
      perl5lib_verbosity verbosity level for PERL5LIB additions
      plugin_list        list of active hooks (see Plugin support above
                         and the CPAN::Plugin module)
      prefer_external_tar
                         per default all untar operations are done with
                         Archive::Tar; by setting this variable to true
                         the external tar command is used if available
      prefer_installer   legal values are MB and EUMM: if a module comes
                         with both a Makefile.PL and a Build.PL, use the
                         former (EUMM) or the latter (MB); if the module
                         comes with only one of the two, that one will be
                         used no matter the setting
      prerequisites_policy
                         what to do if you are missing module prerequisites
                         ('follow' automatically, 'ask' me, or 'ignore')
                         For 'follow', also sets PERL_AUTOINSTALL and
                         PERL_EXTUTILS_AUTOINSTALL for "--defaultdeps" if
                         not already set
      prefs_dir          local directory to store per-distro build options
      proxy_user         username for accessing an authenticating proxy
      proxy_pass         password for accessing an authenticating proxy
      pushy_https        use https to cpan.org when possible, otherwise use http
                         to cpan.org and issue a warning
      randomize_urllist  add some randomness to the sequence of the urllist
      recommends_policy  whether recommended prerequisites should be included
      scan_cache         controls scanning of cache ('atstart', 'atexit' or 'never')
      shell              your favorite shell
      show_unparsable_versions
                         boolean if r command tells which modules are versionless
      show_upload_date   boolean if commands should try to determine upload date
      show_zero_versions boolean if r command tells for which modules $version==0
      suggests_policy    whether suggested prerequisites should be included
      tar                location of external program tar
      tar_verbosity      verbosity level for the tar command
      term_is_latin      deprecated: if true Unicode is translated to ISO-8859-1
                         (and nonsense for characters outside latin range)
      term_ornaments     boolean to turn ReadLine ornamenting on/off
      test_report        email test reports (if CPAN::Reporter is installed)
      trust_test_report_history
                         skip testing when previously tested ok (according to
                         CPAN::Reporter history)
      unzip              location of external program unzip
      urllist            arrayref to nearby CPAN sites (or equivalent locations)
      urllist_ping_external
                         use external ping command when autoselecting mirrors
      urllist_ping_verbose
                         increase verbosity when autoselecting mirrors
      use_prompt_default set PERL_MM_USE_DEFAULT for configure/make/test/install
      use_sqlite         use CPAN::SQLite for metadata storage (fast and lean)
      username           your username if you CPAN server wants one
      version_timeout    stops version parsing after this many seconds.
                         Default is 15 secs. Set to 0 to disable.
      wait_list          arrayref to a wait server to try (See CPAN::WAIT)
      wget               path to external prg
      yaml_load_code     enable YAML code deserialisation via CPAN::DeferredCode
      yaml_module        which module to use to read/write YAML files

    You can set and query each of these options interactively in the cpan
    shell with the "o conf" or the "o conf init" command as specified below.

    "o conf "
      prints the current value of the *scalar option*

    "o conf  "
      Sets the value of the *scalar option* to *value*

    "o conf "
      prints the current value of the *list option* in MakeMaker's neatvalue
      format.

    "o conf  [shift|pop]"
      shifts or pops the array in the *list option* variable

    "o conf  [unshift|push|splice] "
      works like the corresponding perl commands.

    interactive editing: o conf init [MATCH|LIST]
      Runs an interactive configuration dialog for matching variables.
      Without argument runs the dialog over all supported config variables.
      To specify a MATCH the argument must be enclosed by slashes.

      Examples:

        o conf init ftp_passive ftp_proxy
        o conf init /color/

      Note: this method of setting config variables often provides more
      explanation about the functioning of a variable than the manpage.

  CPAN::anycwd($path): Note on config variable getcwd
    CPAN.pm changes the current working directory often and needs to
    determine its own current working directory. By default it uses
    Cwd::cwd, but if for some reason this doesn't work on your system,
    configure alternatives according to the following table:

    cwd Calls Cwd::cwd

    getcwd
        Calls Cwd::getcwd

    fastcwd
        Calls Cwd::fastcwd

    getdcwd
        Calls Cwd::getdcwd

    backtickcwd
        Calls the external command cwd.

  Note on the format of the urllist parameter
    urllist parameters are URLs according to RFC 1738. We do a little
    guessing if your URL is not compliant, but if you have problems with
    "file" URLs, please try the correct format. Either:

        file://localhost/whatever/ftp/pub/CPAN/

    or

        file:///home/ftp/pub/CPAN/

  The urllist parameter has CD-ROM support
    The "urllist" parameter of the configuration table contains a list of
    URLs used for downloading. If the list contains any "file" URLs, CPAN
    always tries there first. This feature is disabled for index files. So
    the recommendation for the owner of a CD-ROM with CPAN contents is:
    include your local, possibly outdated CD-ROM as a "file" URL at the end
    of urllist, e.g.

      o conf urllist push file://localhost/CDROM/CPAN

    CPAN.pm will then fetch the index files from one of the CPAN sites that
    come at the beginning of urllist. It will later check for each module to
    see whether there is a local copy of the most recent version.

    Another peculiarity of urllist is that the site that we could
    successfully fetch the last file from automatically gets a preference
    token and is tried as the first site for the next request. So if you add
    a new site at runtime it may happen that the previously preferred site
    will be tried another time. This means that if you want to disallow a
    site for the next transfer, it must be explicitly removed from urllist.

  Maintaining the urllist parameter
    If you have YAML.pm (or some other YAML module configured in
    "yaml_module") installed, CPAN.pm collects a few statistical data about
    recent downloads. You can view the statistics with the "hosts" command
    or inspect them directly by looking into the "FTPstats.yml" file in your
    "cpan_home" directory.

    To get some interesting statistics, it is recommended that
    "randomize_urllist" be set; this introduces some amount of randomness
    into the URL selection.

  The "requires" and "build_requires" dependency declarations
    Since CPAN.pm version 1.88_51 modules declared as "build_requires" by a
    distribution are treated differently depending on the config variable
    "build_requires_install_policy". By setting
    "build_requires_install_policy" to "no", such a module is not installed.
    It is only built and tested, and then kept in the list of tested but
    uninstalled modules. As such, it is available during the build of the
    dependent module by integrating the path to the "blib/arch" and
    "blib/lib" directories in the environment variable PERL5LIB. If
    "build_requires_install_policy" is set to "yes", then both modules
    declared as "requires" and those declared as "build_requires" are
    treated alike. By setting to "ask/yes" or "ask/no", CPAN.pm asks the
    user and sets the default accordingly.

  Configuration of the allow_installing_* parameters
    The "allow_installing_*" parameters are evaluated during the "make"
    phase. If set to "yes", they allow the testing and the installation of
    the current distro and otherwise have no effect. If set to "no", they
    may abort the build (preventing testing and installing), depending on
    the contents of the "blib/" directory. The "blib/" directory is the
    directory that holds all the files that would usually be installed in
    the "install" phase.

    "allow_installing_outdated_dists" compares the "blib/" directory with
    the CPAN index. If it finds something there that belongs, according to
    the index, to a different dist, it aborts the current build.

    "allow_installing_module_downgrades" compares the "blib/" directory with
    already installed modules, actually their version numbers, as determined
    by ExtUtils::MakeMaker or equivalent. If a to-be-installed module would
    downgrade an already installed module, the current build is aborted.

    An interesting twist occurs when a distroprefs document demands the
    installation of an outdated dist via goto while
    "allow_installing_outdated_dists" forbids it. Without additional
    provisions, this would let the "allow_installing_outdated_dists" win and
    the distroprefs lose. So the proper arrangement in such a case is to
    write a second distroprefs document for the distro that "goto" points to
    and overrule the "cpanconfig" there. E.g.:

      ---
      match:
        distribution: "^MAUKE/Keyword-Simple-0.04.tar.gz"
      goto: "MAUKE/Keyword-Simple-0.03.tar.gz"
      ---
      match:
        distribution: "^MAUKE/Keyword-Simple-0.03.tar.gz"
      cpanconfig:
        allow_installing_outdated_dists: yes

  Configuration for individual distributions (*Distroprefs*)
    (Note: This feature has been introduced in CPAN.pm 1.8854)

    Distributions on CPAN usually behave according to what we call the CPAN
    mantra. Or since the advent of Module::Build we should talk about two
    mantras:

        perl Makefile.PL     perl Build.PL
        make                 ./Build
        make test            ./Build test
        make install         ./Build install

    But some modules cannot be built with this mantra. They try to get some
    extra data from the user via the environment, extra arguments, or
    interactively--thus disturbing the installation of large bundles like
    Phalanx100 or modules with many dependencies like Plagger.

    The distroprefs system of "CPAN.pm" addresses this problem by allowing
    the user to specify extra informations and recipes in YAML files to
    either

    *   pass additional arguments to one of the four commands,

    *   set environment variables

    *   instantiate an Expect object that reads from the console, waits for
        some regular expressions and enters some answers

    *   temporarily override assorted "CPAN.pm" configuration variables

    *   specify dependencies the original maintainer forgot

    *   disable the installation of an object altogether

    See the YAML and Data::Dumper files that come with the "CPAN.pm"
    distribution in the "distroprefs/" directory for examples.

  Filenames
    The YAML files themselves must have the ".yml" extension; all other
    files are ignored (for two exceptions see *Fallback Data::Dumper and
    Storable* below). The containing directory can be specified in "CPAN.pm"
    in the "prefs_dir" config variable. Try "o conf init prefs_dir" in the
    CPAN shell to set and activate the distroprefs system.

    Every YAML file may contain arbitrary documents according to the YAML
    specification, and every document is treated as an entity that can
    specify the treatment of a single distribution.

    Filenames can be picked arbitrarily; "CPAN.pm" always reads all files
    (in alphabetical order) and takes the key "match" (see below in
    *Language Specs*) as a hashref containing match criteria that determine
    if the current distribution matches the YAML document or not.

  Fallback Data::Dumper and Storable
    If neither your configured "yaml_module" nor YAML.pm is installed,
    CPAN.pm falls back to using Data::Dumper and Storable and looks for
    files with the extensions ".dd" or ".st" in the "prefs_dir" directory.
    These files are expected to contain one or more hashrefs. For
    Data::Dumper generated files, this is expected to be done with by
    defining $VAR1, $VAR2, etc. The YAML shell would produce these with the
    command

        ysh < somefile.yml > somefile.dd

    For Storable files the rule is that they must be constructed such that
    "Storable::retrieve(file)" returns an array reference and the array
    elements represent one distropref object each. The conversion from YAML
    would look like so:

        perl -MYAML=LoadFile -MStorable=nstore -e '
            @y=LoadFile(shift);
            nstore(\@y, shift)' somefile.yml somefile.st

    In bootstrapping situations it is usually sufficient to translate only a
    few YAML files to Data::Dumper for crucial modules like "YAML::Syck",
    "YAML.pm" and "Expect.pm". If you prefer Storable over Data::Dumper,
    remember to pull out a Storable version that writes an older format than
    all the other Storable versions that will need to read them.

  Blueprint
    The following example contains all supported keywords and structures
    with the exception of "eexpect" which can be used instead of "expect".

      ---
      comment: "Demo"
      match:
        module: "Dancing::Queen"
        distribution: "^CHACHACHA/Dancing-"
        not_distribution: "\.zip$"
        perl: "/usr/local/cariba-perl/bin/perl"
        perlconfig:
          archname: "freebsd"
          not_cc: "gcc"
        env:
          DANCING_FLOOR: "Shubiduh"
      disabled: 1
      cpanconfig:
        make: gmake
      pl:
        args:
          - "--somearg=specialcase"

        env: {}

        expect:
          - "Which is your favorite fruit"
          - "apple\n"

      make:
        args:
          - all
          - extra-all

        env: {}

        expect: []

        commandline: "echo SKIPPING make"

      test:
        args: []

        env: {}

        expect: []

      install:
        args: []

        env:
          WANT_TO_INSTALL: YES

        expect:
          - "Do you really want to install"
          - "y\n"

      patches:
        - "ABCDE/Fedcba-3.14-ABCDE-01.patch"

      depends:
        configure_requires:
          LWP: 5.8
        build_requires:
          Test::Exception: 0.25
        requires:
          Spiffy: 0.30

  Language Specs
    Every YAML document represents a single hash reference. The valid keys
    in this hash are as follows:

    comment [scalar]
        A comment

    cpanconfig [hash]
        Temporarily override assorted "CPAN.pm" configuration variables.

        Supported are: "build_requires_install_policy", "check_sigs",
        "make", "make_install_make_command", "prefer_installer",
        "test_report". Please report as a bug when you need another one
        supported.

    depends [hash] *** EXPERIMENTAL FEATURE ***
        All three types, namely "configure_requires", "build_requires", and
        "requires" are supported in the way specified in the META.yml
        specification. The current implementation *merges* the specified
        dependencies with those declared by the package maintainer. In a
        future implementation this may be changed to override the original
        declaration.

    disabled [boolean]
        Specifies that this distribution shall not be processed at all.

    features [array] *** EXPERIMENTAL FEATURE ***
        Experimental implementation to deal with optional_features from
        META.yml. Still needs coordination with installer software and
        currently works only for META.yml declaring "dynamic_config=0". Use
        with caution.

    goto [string]
        The canonical name of a delegate distribution to install instead.
        Useful when a new version, although it tests OK itself, breaks
        something else or a developer release or a fork is already uploaded
        that is better than the last released version.

    install [hash]
        Processing instructions for the "make install" or "./Build install"
        phase of the CPAN mantra. See below under *Processing Instructions*.

    make [hash]
        Processing instructions for the "make" or "./Build" phase of the
        CPAN mantra. See below under *Processing Instructions*.

    match [hash]
        A hashref with one or more of the keys "distribution", "module",
        "perl", "perlconfig", and "env" that specify whether a document is
        targeted at a specific CPAN distribution or installation. Keys
        prefixed with "not_" negates the corresponding match.

        The corresponding values are interpreted as regular expressions. The
        "distribution" related one will be matched against the canonical
        distribution name, e.g. "AUTHOR/Foo-Bar-3.14.tar.gz".

        The "module" related one will be matched against *all* modules
        contained in the distribution until one module matches.

        The "perl" related one will be matched against $^X (but with the
        absolute path).

        The value associated with "perlconfig" is itself a hashref that is
        matched against corresponding values in the %Config::Config hash
        living in the "Config.pm" module. Keys prefixed with "not_" negates
        the corresponding match.

        The value associated with "env" is itself a hashref that is matched
        against corresponding values in the %ENV hash. Keys prefixed with
        "not_" negates the corresponding match.

        If more than one restriction of "module", "distribution", etc. is
        specified, the results of the separately computed match values must
        all match. If so, the hashref represented by the YAML document is
        returned as the preference structure for the current distribution.

    patches [array]
        An array of patches on CPAN or on the local disk to be applied in
        order via an external patch program. If the value for the "-p"
        parameter is 0 or 1 is determined by reading the patch beforehand.
        The path to each patch is either an absolute path on the local
        filesystem or relative to a patch directory specified in the
        "patches_dir" configuration variable or in the format of a canonical
        distro name. For examples please consult the distroprefs/ directory
        in the CPAN.pm distribution (these examples are not installed by
        default).

        Note: if the "applypatch" program is installed and "CPAN::Config"
        knows about it and a patch is written by the "makepatch" program,
        then "CPAN.pm" lets "applypatch" apply the patch. Both "makepatch"
        and "applypatch" are available from CPAN in the "JV/makepatch-*"
        distribution.

    pl [hash]
        Processing instructions for the "perl Makefile.PL" or "perl
        Build.PL" phase of the CPAN mantra. See below under *Processing
        Instructions*.

    test [hash]
        Processing instructions for the "make test" or "./Build test" phase
        of the CPAN mantra. See below under *Processing Instructions*.

  Processing Instructions
    args [array]
        Arguments to be added to the command line

    commandline
        A full commandline to run via "system()". During execution, the
        environment variable PERL is set to $^X (but with an absolute path).
        If "commandline" is specified, "args" is not used.

    eexpect [hash]
        Extended "expect". This is a hash reference with four allowed keys,
        "mode", "timeout", "reuse", and "talk".

        You must install the "Expect" module to use "eexpect". CPAN.pm does
        not install it for you.

        "mode" may have the values "deterministic" for the case where all
        questions come in the order written down and "anyorder" for the case
        where the questions may come in any order. The default mode is
        "deterministic".

        "timeout" denotes a timeout in seconds. Floating-point timeouts are
        OK. With "mode=deterministic", the timeout denotes the timeout per
        question; with "mode=anyorder" it denotes the timeout per byte
        received from the stream or questions.

        "talk" is a reference to an array that contains alternating
        questions and answers. Questions are regular expressions and answers
        are literal strings. The Expect module watches the stream from the
        execution of the external program ("perl Makefile.PL", "perl
        Build.PL", "make", etc.).

        For "mode=deterministic", the CPAN.pm injects the corresponding
        answer as soon as the stream matches the regular expression.

        For "mode=anyorder" CPAN.pm answers a question as soon as the
        timeout is reached for the next byte in the input stream. In this
        mode you can use the "reuse" parameter to decide what will happen
        with a question-answer pair after it has been used. In the default
        case (reuse=0) it is removed from the array, avoiding being used
        again accidentally. If you want to answer the question "Do you
        really want to do that" several times, then it must be included in
        the array at least as often as you want this answer to be given.
        Setting the parameter "reuse" to 1 makes this repetition
        unnecessary.

    env [hash]
        Environment variables to be set during the command

    expect [array]
        You must install the "Expect" module to use "expect". CPAN.pm does
        not install it for you.

        "expect: " is a short notation for this "eexpect":

                eexpect:
                        mode: deterministic
                        timeout: 15
                        talk: 

  Schema verification with "Kwalify"
    If you have the "Kwalify" module installed (which is part of the
    Bundle::CPANxxl), then all your distroprefs files are checked for
    syntactic correctness.

  Example Distroprefs Files
    "CPAN.pm" comes with a collection of example YAML files. Note that these
    are really just examples and should not be used without care because
    they cannot fit everybody's purpose. After all, the authors of the
    packages that ask questions had a need to ask, so you should watch their
    questions and adjust the examples to your environment and your needs.
    You have been warned:-)

PROGRAMMER'S INTERFACE
    If you do not enter the shell, shell commands are available both as
    methods ("CPAN::Shell->install(...)") and as functions in the calling
    package ("install(...)"). Before calling low-level commands, it makes
    sense to initialize components of CPAN you need, e.g.:

      CPAN::HandleConfig->load;
      CPAN::Shell::setup_output;
      CPAN::Index->reload;

    High-level commands do such initializations automatically.

    There's currently only one class that has a stable interface -
    CPAN::Shell. All commands that are available in the CPAN shell are
    methods of the class CPAN::Shell. The arguments on the commandline are
    passed as arguments to the method.

    So if you take for example the shell command

      notest install A B C

    the actually executed command is

      CPAN::Shell->notest("install","A","B","C");

    Each of the commands that produce listings of modules ("r",
    "autobundle", "u") also return a list of the IDs of all modules within
    the list.

    expand($type,@things)
      The IDs of all objects available within a program are strings that can
      be expanded to the corresponding real objects with the
      "CPAN::Shell->expand("Module",@things)" method. Expand returns a list
      of CPAN::Module objects according to the @things arguments given. In
      scalar context, it returns only the first element of the list.

    expandany(@things)
      Like expand, but returns objects of the appropriate type, i.e.
      CPAN::Bundle objects for bundles, CPAN::Module objects for modules,
      and CPAN::Distribution objects for distributions. Note: it does not
      expand to CPAN::Author objects.

    Programming Examples
      This enables the programmer to do operations that combine
      functionalities that are available in the shell.

          # install everything that is outdated on my disk:
          perl -MCPAN -e 'CPAN::Shell->install(CPAN::Shell->r)'

          # install my favorite programs if necessary:
          for $mod (qw(Net::FTP Digest::SHA Data::Dumper)) {
              CPAN::Shell->install($mod);
          }

          # list all modules on my disk that have no VERSION number
          for $mod (CPAN::Shell->expand("Module","/./")) {
              next unless $mod->inst_file;
              # MakeMaker convention for undefined $VERSION:
              next unless $mod->inst_version eq "undef";
              print "No VERSION in ", $mod->id, "\n";
          }

          # find out which distribution on CPAN contains a module:
          print CPAN::Shell->expand("Module","Apache::Constants")->cpan_file

      Or if you want to schedule a *cron* job to watch CPAN, you could list
      all modules that need updating. First a quick and dirty way:

          perl -e 'use CPAN; CPAN::Shell->r;'

      If you don't want any output should all modules be up to date, parse
      the output of above command for the regular expression "/modules are
      up to date/" and decide to mail the output only if it doesn't match.

      If you prefer to do it more in a programmerish style in one single
      process, something like this may better suit you:

        # list all modules on my disk that have newer versions on CPAN
        for $mod (CPAN::Shell->expand("Module","/./")) {
          next unless $mod->inst_file;
          next if $mod->uptodate;
          printf "Module %s is installed as %s, could be updated to %s from CPAN\n",
              $mod->id, $mod->inst_version, $mod->cpan_version;
        }

      If that gives too much output every day, you may want to watch only
      for three modules. You can write

        for $mod (CPAN::Shell->expand("Module","/Apache|LWP|CGI/")) {

      as the first line instead. Or you can combine some of the above
      tricks:

        # watch only for a new mod_perl module
        $mod = CPAN::Shell->expand("Module","mod_perl");
        exit if $mod->uptodate;
        # new mod_perl arrived, let me know all update recommendations
        CPAN::Shell->r;

  Methods in the other Classes
    CPAN::Author::as_glimpse()
        Returns a one-line description of the author

    CPAN::Author::as_string()
        Returns a multi-line description of the author

    CPAN::Author::email()
        Returns the author's email address

    CPAN::Author::fullname()
        Returns the author's name

    CPAN::Author::name()
        An alias for fullname

    CPAN::Bundle::as_glimpse()
        Returns a one-line description of the bundle

    CPAN::Bundle::as_string()
        Returns a multi-line description of the bundle

    CPAN::Bundle::clean()
        Recursively runs the "clean" method on all items contained in the
        bundle.

    CPAN::Bundle::contains()
        Returns a list of objects' IDs contained in a bundle. The associated
        objects may be bundles, modules or distributions.

    CPAN::Bundle::force($method,@args)
        Forces CPAN to perform a task that it normally would have refused to
        do. Force takes as arguments a method name to be called and any
        number of additional arguments that should be passed to the called
        method. The internals of the object get the needed changes so that
        CPAN.pm does not refuse to take the action. The "force" is passed
        recursively to all contained objects. See also the section above on
        the "force" and the "fforce" pragma.

    CPAN::Bundle::get()
        Recursively runs the "get" method on all items contained in the
        bundle

    CPAN::Bundle::inst_file()
        Returns the highest installed version of the bundle in either @INC
        or "$CPAN::Config->{cpan_home}". Note that this is different from
        CPAN::Module::inst_file.

    CPAN::Bundle::inst_version()
        Like CPAN::Bundle::inst_file, but returns the $VERSION

    CPAN::Bundle::uptodate()
        Returns 1 if the bundle itself and all its members are up-to-date.

    CPAN::Bundle::install()
        Recursively runs the "install" method on all items contained in the
        bundle

    CPAN::Bundle::make()
        Recursively runs the "make" method on all items contained in the
        bundle

    CPAN::Bundle::readme()
        Recursively runs the "readme" method on all items contained in the
        bundle

    CPAN::Bundle::test()
        Recursively runs the "test" method on all items contained in the
        bundle

    CPAN::Distribution::as_glimpse()
        Returns a one-line description of the distribution

    CPAN::Distribution::as_string()
        Returns a multi-line description of the distribution

    CPAN::Distribution::author
        Returns the CPAN::Author object of the maintainer who uploaded this
        distribution

    CPAN::Distribution::pretty_id()
        Returns a string of the form "AUTHORID/TARBALL", where AUTHORID is
        the author's PAUSE ID and TARBALL is the distribution filename.

    CPAN::Distribution::base_id()
        Returns the distribution filename without any archive suffix. E.g
        "Foo-Bar-0.01"

    CPAN::Distribution::clean()
        Changes to the directory where the distribution has been unpacked
        and runs "make clean" there.

    CPAN::Distribution::containsmods()
        Returns a list of IDs of modules contained in a distribution file.
        Works only for distributions listed in the 02packages.details.txt.gz
        file. This typically means that just most recent version of a
        distribution is covered.

    CPAN::Distribution::cvs_import()
        Changes to the directory where the distribution has been unpacked
        and runs something like

            cvs -d $cvs_root import -m $cvs_log $cvs_dir $userid v$version

        there.

    CPAN::Distribution::dir()
        Returns the directory into which this distribution has been
        unpacked.

    CPAN::Distribution::force($method,@args)
        Forces CPAN to perform a task that it normally would have refused to
        do. Force takes as arguments a method name to be called and any
        number of additional arguments that should be passed to the called
        method. The internals of the object get the needed changes so that
        CPAN.pm does not refuse to take the action. See also the section
        above on the "force" and the "fforce" pragma.

    CPAN::Distribution::get()
        Downloads the distribution from CPAN and unpacks it. Does nothing if
        the distribution has already been downloaded and unpacked within the
        current session.

    CPAN::Distribution::install()
        Changes to the directory where the distribution has been unpacked
        and runs the external command "make install" there. If "make" has
        not yet been run, it will be run first. A "make test" is issued in
        any case and if this fails, the install is cancelled. The
        cancellation can be avoided by letting "force" run the "install" for
        you.

        This install method only has the power to install the distribution
        if there are no dependencies in the way. To install an object along
        with all its dependencies, use CPAN::Shell->install.

        Note that install() gives no meaningful return value. See
        uptodate().

    CPAN::Distribution::isa_perl()
        Returns 1 if this distribution file seems to be a perl distribution.
        Normally this is derived from the file name only, but the index from
        CPAN can contain a hint to achieve a return value of true for other
        filenames too.

    CPAN::Distribution::look()
        Changes to the directory where the distribution has been unpacked
        and opens a subshell there. Exiting the subshell returns.

    CPAN::Distribution::make()
        First runs the "get" method to make sure the distribution is
        downloaded and unpacked. Changes to the directory where the
        distribution has been unpacked and runs the external commands "perl
        Makefile.PL" or "perl Build.PL" and "make" there.

    CPAN::Distribution::perldoc()
        Downloads the pod documentation of the file associated with a
        distribution (in HTML format) and runs it through the external
        command *lynx* specified in "$CPAN::Config->{lynx}". If *lynx* isn't
        available, it converts it to plain text with the external command
        *html2text* and runs it through the pager specified in
        "$CPAN::Config->{pager}".

    CPAN::Distribution::prefs()
        Returns the hash reference from the first matching YAML file that
        the user has deposited in the "prefs_dir/" directory. The first
        succeeding match wins. The files in the "prefs_dir/" are processed
        alphabetically, and the canonical distro name (e.g.
        AUTHOR/Foo-Bar-3.14.tar.gz) is matched against the regular
        expressions stored in the $root->{match}{distribution} attribute
        value. Additionally all module names contained in a distribution are
        matched against the regular expressions in the
        $root->{match}{module} attribute value. The two match values are
        ANDed together. Each of the two attributes are optional.

    CPAN::Distribution::prereq_pm()
        Returns the hash

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