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CPAN(3pm)                             Perl Programmers Reference Guide                             CPAN(3pm)



NAME
       CPAN - query, download and build perl modules from CPAN sites

SYNOPSIS
       Interactive mode:

         perl -MCPAN -e shell

       --or--cpan --or-cpan

         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 <distribution_file>

         is also run unconditionally. But for

           install <module>

         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 CHECKUMS 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.

       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.

   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
       underbar 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.

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:

         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
         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
         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
         randomize_urllist  add some randomness to the sequence of the urllist
         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
         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)
         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 <scalar option>"
         prints the current value of the scalar option

       "o conf <scalar option> <value>"
         Sets the value of the scalar option to value

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

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

       "o conf <list option> [unshift|push|splice] <list>"
         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

       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 ti "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 for individual distributions (Distroprefs)
       (Note: This feature has been introduced in CPAN.pm 1.8854 and is still considered beta quality)

       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: --comment:
         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", "modules", "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: <array>" is a short notation for this "eexpect":

                   eexpect:
                           mode: deterministic
                           timeout: 15
                           talk: <array>

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

       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 reference that has been announced by a distribution as the "requires" and
           "build_requires" elements. These can be declared either by the "META.yml" (if authoritative) or
           can be deposited after the run of "Build.PL" in the file "./_build/prereqs" or after the run of
           "Makfile.PL" written as the "PREREQ_PM" hash in a comment in the produced "Makefile". Note: this
           method only works after an attempt has been made to "make" the distribution. Returns undef
           otherwise.

       CPAN::Distribution::readme()
           Downloads the README file associated with a distribution and runs it through the pager specified
           in "$CPAN::Config->{pager}".

       CPAN::Distribution::reports()
           Downloads report data for this distribution from www.cpantesters.org and displays a subset of
           them.

       CPAN::Distribution::read_yaml()
           Returns the content of the META.yml of this distro as a hashref. Note: works only after an
           attempt has been made to "make" the distribution.  Returns undef otherwise. Also returns undef if
           the content of META.yml is not authoritative. (The rules about what exactly makes the content
           authoritative are still in flux.)

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

       CPAN::Distribution::uptodate()
           Returns 1 if all the modules contained in the distribution are up-to-date. Relies on
           containsmods.

       CPAN::Index::force_reload()
           Forces a reload of all indices.

       CPAN::Index::reload()
           Reloads all indices if they have not been read for more than "$CPAN::Config->{index_expire}"
           days.

       CPAN::InfoObj::dump()
           CPAN::Author, CPAN::Bundle, CPAN::Module, and CPAN::Distribution inherit this method. It prints
           the data structure associated with an object. Useful for debugging. Note: the data structure is
           considered internal and thus subject to change without notice.

       CPAN::Module::as_glimpse()
           Returns a one-line description of the module in four columns: The first column contains the word
           "Module", the second column consists of one character: an equals sign if this module is already
           installed and up-to-date, a less-than sign if this module is installed but can be upgraded, and a
           space if the module is not installed. The third column is the name of the module and the fourth
           column gives maintainer or distribution information.

       CPAN::Module::as_string()
           Returns a multi-line description of the module

       CPAN::Module::clean()
           Runs a clean on the distribution associated with this module.

       CPAN::Module::cpan_file()
           Returns the filename on CPAN that is associated with the module.

       CPAN::Module::cpan_version()
           Returns the latest version of this module available on CPAN.

       CPAN::Module::cvs_import()
           Runs a cvs_import on the distribution associated with this module.

       CPAN::Module::description()
           Returns a 44 character description of this module. Only available for modules listed in The
           Module List (CPAN/modules/00modlist.long.html or 00modlist.long.txt.gz)

       CPAN::Module::distribution()
           Returns the CPAN::Distribution object that contains the current version of this module.

       CPAN::Module::dslip_status()
           Returns a hash reference. The keys of the hash are the letters "D", "S", "L", "I", and <P>, for
           development status, support level, language, interface and public licence respectively. The data
           for the DSLIP status are collected by pause.perl.org when authors register their namespaces. The
           values of the 5 hash elements are one-character words whose meaning is described in the table
           below. There are also 5 hash elements "DV", "SV", "LV", "IV", and <PV> that carry a more verbose
           value of the 5 status variables.

           Where the 'DSLIP' characters have the following meanings:

             D - Development Stage  (Note: *NO IMPLIED TIMESCALES*):
               i   - Idea, listed to gain consensus or as a placeholder
               c   - under construction but pre-alpha (not yet released)
               a/b - Alpha/Beta testing
               R   - Released
               M   - Mature (no rigorous definition)
               S   - Standard, supplied with Perl 5

             S - Support Level:
               m   - Mailing-list
               d   - Developer
               u   - Usenet newsgroup comp.lang.perl.modules
               n   - None known, try comp.lang.perl.modules
               a   - abandoned; volunteers welcome to take over maintenance

             L - Language Used:
               p   - Perl-only, no compiler needed, should be platform independent
               c   - C and perl, a C compiler will be needed
               h   - Hybrid, written in perl with optional C code, no compiler needed
               +   - C++ and perl, a C++ compiler will be needed
               o   - perl and another language other than C or C++

             I - Interface Style
               f   - plain Functions, no references used
               h   - hybrid, object and function interfaces available
               n   - no interface at all (huh?)
               r   - some use of unblessed References or ties
               O   - Object oriented using blessed references and/or inheritance

             P - Public License
               p   - Standard-Perl: user may choose between GPL and Artistic
               g   - GPL: GNU General Public License
               l   - LGPL: "GNU Lesser General Public License" (previously known as
                     "GNU Library General Public License")
               b   - BSD: The BSD License
               a   - Artistic license alone
               2   - Artistic license 2.0 or later
               o   - open source: approved by www.opensource.org
               d   - allows distribution without restrictions
               r   - restricted distribution
               n   - no license at all

       CPAN::Module::force($method,@args)
           Forces CPAN to perform a task it would normally refuse to do. Force takes as arguments a method
           name to be invoked and any number of additional arguments to pass that 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::Module::get()
           Runs a get on the distribution associated with this module.

       CPAN::Module::inst_file()
           Returns the filename of the module found in @INC. The first file found is reported, just as perl
           itself stops searching @INC once it finds a module.

       CPAN::Module::available_file()
           Returns the filename of the module found in PERL5LIB or @INC. The first file found is reported.
           The advantage of this method over "inst_file" is that modules that have been tested but not yet
           installed are included because PERL5LIB keeps track of tested modules.

       CPAN::Module::inst_version()
           Returns the version number of the installed module in readable format.

       CPAN::Module::available_version()
           Returns the version number of the available module in readable format.

       CPAN::Module::install()
           Runs an "install" on the distribution associated with this module.

       CPAN::Module::look()
           Changes to the directory where the distribution associated with this module has been unpacked and
           opens a subshell there. Exiting the subshell returns.

       CPAN::Module::make()
           Runs a "make" on the distribution associated with this module.

       CPAN::Module::manpage_headline()
           If module is installed, peeks into the module's manpage, reads the headline, and returns it.
           Moreover, if the module has been downloaded within this session, does the equivalent on the
           downloaded module even if it hasn't been installed yet.

       CPAN::Module::perldoc()
           Runs a "perldoc" on this module.

       CPAN::Module::readme()
           Runs a "readme" on the distribution associated with this module.

       CPAN::Module::reports()
           Calls the reports() method on the associated distribution object.

       CPAN::Module::test()
           Runs a "test" on the distribution associated with this module.

       CPAN::Module::uptodate()
           Returns 1 if the module is installed and up-to-date.

       CPAN::Module::userid()
           Returns the author's ID of the module.

   Cache Manager
       Currently the cache manager only keeps track of the build directory ($CPAN::Config->{build_dir}). It
       is a simple FIFO mechanism that deletes complete directories below "build_dir" as soon as the size of
       all directories there gets bigger than $CPAN::Config->{build_cache} (in MB). The contents of this
       cache may be used for later re-installations that you intend to do manually, but will never be
       trusted by CPAN itself. This is due to the fact that the user might use these directories for
       building modules on different architectures.

       There is another directory ($CPAN::Config->{keep_source_where}) where the original distribution files
       are kept. This directory is not covered by the cache manager and must be controlled by the user. If
       you choose to have the same directory as build_dir and as keep_source_where directory, then your
       sources will be deleted with the same fifo mechanism.

   Bundles
       A bundle is just a perl module in the namespace Bundle:: that does not define any functions or
       methods. It usually only contains documentation.

       It starts like a perl module with a package declaration and a $VERSION variable. After that the pod
       section looks like any other pod with the only difference being that one special pod section exists
       starting with (verbatim):

           =head1 CONTENTS

       In this pod section each line obeys the format

               Module_Name [Version_String] [- optional text]

       The only required part is the first field, the name of a module (e.g. Foo::Bar, i.e. not the name of
       the distribution file). The rest of the line is optional. The comment part is delimited by a dash
       just as in the man page header.

       The distribution of a bundle should follow the same convention as other distributions.

       Bundles are treated specially in the CPAN package. If you say 'install Bundle::Tkkit' (assuming such
       a bundle exists), CPAN will install all the modules in the CONTENTS section of the pod. You can
       install your own Bundles locally by placing a conformant Bundle file somewhere into your @INC path.
       The autobundle() command which is available in the shell interface does that for you by including all
       currently installed modules in a snapshot bundle file.

PREREQUISITES
       The CPAN program is trying to depend on as little as possible so the user can use it in hostile
       environment. It works better the more goodies the environment provides. For example if you try in the
       CPAN shell

         install Bundle::CPAN

       or

         install Bundle::CPANxxl

       you will find the shell more convenient than the bare shell before.

       If you have a local mirror of CPAN and can access all files with "file:" URLs, then you only need a
       perl later than perl5.003 to run this module. Otherwise Net::FTP is strongly recommended. LWP may be
       required for non-UNIX systems, or if your nearest CPAN site is associated with a URL that is not
       "ftp:".

       If you have neither Net::FTP nor LWP, there is a fallback mechanism implemented for an external ftp
       command or for an external lynx command.

UTILITIES
   Finding packages and VERSION
       This module presumes that all packages on CPAN

        declare their $VERSION variable in an easy to parse manner. This prerequisite can hardly be relaxed
         because it consumes far too much memory to load all packages into the running program just to
         determine the $VERSION variable. Currently all programs that are dealing with version use something
         like this

             perl -MExtUtils::MakeMaker -le \
                 'print MM->parse_version(shift)' filename

         If you are author of a package and wonder if your $VERSION can be parsed, please try the above
         method.

        come as compressed or gzipped tarfiles or as zip files and contain a "Makefile.PL" or "Build.PL"
         (well, we try to handle a bit more, but with little enthusiasm).

   Debugging
       Debugging this module is more than a bit complex due to interference from the software producing the
       indices on CPAN, the mirroring process on CPAN, packaging, configuration, synchronicity, and even
       (gasp!) due to bugs within the CPAN.pm module itself.

       For debugging the code of CPAN.pm itself in interactive mode, some debugging aid can be turned on for
       most packages within CPAN.pm with one of

       o debug package...
         sets debug mode for packages.

       o debug -package...
         unsets debug mode for packages.

       o debug all
         turns debugging on for all packages.

       o debug number

       which sets the debugging packages directly. Note that "o debug 0" turns debugging off.

       What seems a successful strategy is the combination of "reload cpan" and the debugging switches. Add
       a new debug statement while running in the shell and then issue a "reload cpan" and see the new
       debugging messages immediately without losing the current context.

       "o debug" without an argument lists the valid package names and the current set of packages in
       debugging mode. "o debug" has built-in completion support.

       For debugging of CPAN data there is the "dump" command which takes the same arguments as
       make/test/install and outputs each object's Data::Dumper dump. If an argument looks like a perl
       variable and contains one of "$", "@" or "%", it is eval()ed and fed to Data::Dumper directly.

   Floppy, Zip, Offline Mode
       CPAN.pm works nicely without network access, too. If you maintain machines that are not networked at
       all, you should consider working with "file:" URLs. You'll have to collect your modules somewhere
       first. So you might use CPAN.pm to put together all you need on a networked machine. Then copy the
       $CPAN::Config->{keep_source_where} (but not $CPAN::Config->{build_dir}) directory on a floppy. This
       floppy is kind of a personal CPAN. CPAN.pm on the non-networked machines works nicely with this
       floppy. See also below the paragraph about CD-ROM support.

   Basic Utilities for Programmers
       has_inst($module)
         Returns true if the module is installed. Used to load all modules into the running CPAN.pm that are
         considered optional. The config variable "dontload_list" intercepts the "has_inst()" call such that
         an optional module is not loaded despite being available. For example, the following command will
         prevent "YAML.pm" from being loaded:

             cpan> o conf dontload_list push YAML

         See the source for details.

       has_usable($module)
         Returns true if the module is installed and in a usable state. Only useful for a handful of modules
         that are used internally. See the source for details.

       instance($module)
         The constructor for all the singletons used to represent modules, distributions, authors, and
         bundles. If the object already exists, this method returns the object; otherwise, it calls the
         constructor.

SECURITY
       There's no strong security layer in CPAN.pm. CPAN.pm helps you to install foreign, unmasked, unsigned
       code on your machine. We compare to a checksum that comes from the net just as the distribution file
       itself. But we try to make it easy to add security on demand:

   Cryptographically signed modules
       Since release 1.77, CPAN.pm has been able to verify cryptographically signed module distributions
       using Module::Signature.  The CPAN modules can be signed by their authors, thus giving more security.
       The simple unsigned MD5 checksums that were used before by CPAN protect mainly against accidental
       file corruption.

       You will need to have Module::Signature installed, which in turn requires that you have at least one
       of Crypt::OpenPGP module or the command-line gpg tool installed.

       You will also need to be able to connect over the Internet to the public key servers, like
       pgp.mit.edu, and their port 11731 (the HKP protocol).

       The configuration parameter check_sigs is there to turn signature checking on or off.

EXPORT
       Most functions in package CPAN are exported by default. The reason for this is that the primary use
       is intended for the cpan shell or for one-liners.

ENVIRONMENT
       When the CPAN shell enters a subshell via the look command, it sets the environment CPAN_SHELL_LEVEL
       to 1, or increments that variable if it is already set.

       When CPAN runs, it sets the environment variable PERL5_CPAN_IS_RUNNING to the ID of the running
       process. It also sets PERL5_CPANPLUS_IS_RUNNING to prevent runaway processes which could happen with
       older versions of Module::Install.

       When running "perl Makefile.PL", the environment variable "PERL5_CPAN_IS_EXECUTING" is set to the
       full path of the "Makefile.PL" that is being executed. This prevents runaway processes with newer
       versions of Module::Install.

       When the config variable ftp_passive is set, all downloads will be run with the environment variable
       FTP_PASSIVE set to this value. This is in general a good idea as it influences both Net::FTP and LWP
       based connections. The same effect can be achieved by starting the cpan shell with this environment
       variable set. For Net::FTP alone, one can also always set passive mode by running libnetcfg.

POPULATE AN INSTALLATION WITH LOTS OF MODULES
       Populating a freshly installed perl with one's favorite modules is pretty easy if you maintain a
       private bundle definition file. To get a useful blueprint of a bundle definition file, the command
       autobundle can be used on the CPAN shell command line. This command writes a bundle definition file
       for all modules installed for the current perl interpreter. It's recommended to run this command once
       only, and from then on maintain the file manually under a private name, say Bundle/my_bundle.pm. With
       a clever bundle file you can then simply say

           cpan> install Bundle::my_bundle

       then answer a few questions and go out for coffee (possibly even in a different city).

       Maintaining a bundle definition file means keeping track of two things: dependencies and
       interactivity. CPAN.pm sometimes fails on calculating dependencies because not all modules define all
       MakeMaker attributes correctly, so a bundle definition file should specify prerequisites as early as
       possible. On the other hand, it's annoying that so many distributions need some interactive
       configuring. So what you can try to accomplish in your private bundle file is to have the packages
       that need to be configured early in the file and the gentle ones later, so you can go out for coffee
       after a few minutes and leave CPAN.pm to churn away untended.

WORKING WITH CPAN.pm BEHIND FIREWALLS
       Thanks to Graham Barr for contributing the following paragraphs about the interaction between perl,
       and various firewall configurations. For further information on firewalls, it is recommended to
       consult the documentation that comes with the ncftp program. If you are unable to go through the
       firewall with a simple Perl setup, it is likely that you can configure ncftp so that it works through
       your firewall.

   Three basic types of firewalls
       Firewalls can be categorized into three basic types.

       http firewall
           This is when the firewall machine runs a web server, and to access the outside world, you must do
           so via that web server. If you set environment variables like http_proxy or ftp_proxy to values
           beginning with http://, or in your web browser you've proxy information set, then you know you
           are running behind an http firewall.

           To access servers outside these types of firewalls with perl (even for ftp), you need LWP or
           HTTP::Tiny.

       ftp firewall
           This where the firewall machine runs an ftp server. This kind of firewall will only let you
           access ftp servers outside the firewall.  This is usually done by connecting to the firewall with
           ftp, then entering a username like "user@outside.host.com".

           To access servers outside these type of firewalls with perl, you need Net::FTP.

       One-way visibility
           One-way visibility means these firewalls try to make themselves invisible to users inside the
           firewall. An FTP data connection is normally created by sending your IP address to the remote
           server and then listening for the return connection. But the remote server will not be able to
           connect to you because of the firewall. For these types of firewall, FTP connections need to be
           done in a passive mode.

           There are two that I can think off.

           SOCKS
               If you are using a SOCKS firewall, you will need to compile perl and link it with the SOCKS
               library.  This is what is normally called a 'socksified' perl. With this executable you will
               be able to connect to servers outside the firewall as if it were not there.

           IP Masquerade
               This is when the firewall implemented in the kernel (via NAT, or networking address
               translation), it allows you to hide a complete network behind one IP address. With this
               firewall no special compiling is needed as you can access hosts directly.

               For accessing ftp servers behind such firewalls you usually need to set the environment
               variable "FTP_PASSIVE" or the config variable ftp_passive to a true value.

   Configuring lynx or ncftp for going through a firewall
       If you can go through your firewall with e.g. lynx, presumably with a command such as

           /usr/local/bin/lynx -pscott:tiger

       then you would configure CPAN.pm with the command

           o conf lynx "/usr/local/bin/lynx -pscott:tiger"

       That's all. Similarly for ncftp or ftp, you would configure something like

           o conf ncftp "/usr/bin/ncftp -f /home/scott/ncftplogin.cfg"

       Your mileage may vary...

FAQ
       1)  I installed a new version of module X but CPAN keeps saying, I have the old version installed

           Probably you do have the old version installed. This can happen if a module installs itself into
           a different directory in the @INC path than it was previously installed. This is not really a
           CPAN.pm problem, you would have the same problem when installing the module manually. The easiest
           way to prevent this behaviour is to add the argument "UNINST=1" to the "make install" call, and
           that is why many people add this argument permanently by configuring

             o conf make_install_arg UNINST=1

       2)  So why is UNINST=1 not the default?

           Because there are people who have their precise expectations about who may install where in the
           @INC path and who uses which @INC array. In fine tuned environments "UNINST=1" can cause damage.

       3)  I want to clean up my mess, and install a new perl along with all modules I have. How do I go
           about it?

           Run the autobundle command for your old perl and optionally rename the resulting bundle file
           (e.g. Bundle/mybundle.pm), install the new perl with the Configure option prefix, e.g.

               ./Configure -Dprefix=/usr/local/perl-5.6.78.9

           Install the bundle file you produced in the first step with something like

               cpan> install Bundle::mybundle

           and you're done.

       4)  When I install bundles or multiple modules with one command there is too much output to keep
           track of.

           You may want to configure something like

             o conf make_arg "| tee -ai /root/.cpan/logs/make.out"
             o conf make_install_arg "| tee -ai /root/.cpan/logs/make_install.out"

           so that STDOUT is captured in a file for later inspection.

       5)  I am not root, how can I install a module in a personal directory?

           As of CPAN 1.9463, if you do not have permission to write the default perl library directories,
           CPAN's configuration process will ask you whether you want to bootstrap <local::lib>, which makes
           keeping a personal perl library directory easy.

           Another thing you should bear in mind is that the UNINST parameter can be dangerous when you are
           installing into a private area because you might accidentally remove modules that other people
           depend on that are not using the private area.

       6)  How to get a package, unwrap it, and make a change before building it?

           Have a look at the "look" (!) command.

       7)  I installed a Bundle and had a couple of fails. When I retried, everything resolved nicely. Can
           this be fixed to work on first try?

           The reason for this is that CPAN does not know the dependencies of all modules when it starts
           out. To decide about the additional items to install, it just uses data found in the META.yml
           file or the generated Makefile. An undetected missing piece breaks the process. But it may well
           be that your Bundle installs some prerequisite later than some depending item and thus your
           second try is able to resolve everything.  Please note, CPAN.pm does not know the dependency tree
           in advance and cannot sort the queue of things to install in a topologically correct order. It
           resolves perfectly well if all modules declare the prerequisites correctly with the PREREQ_PM
           attribute to MakeMaker or the "requires" stanza of Module::Build. For bundles which fail and you
           need to install often, it is recommended to sort the Bundle definition file manually.

       8)  In our intranet, we have many modules for internal use. How can I integrate these modules with
           CPAN.pm but without uploading the modules to CPAN?

           Have a look at the CPAN::Site module.

       9)  When I run CPAN's shell, I get an error message about things in my "/etc/inputrc" (or
           "~/.inputrc") file.

           These are readline issues and can only be fixed by studying readline configuration on your
           architecture and adjusting the referenced file accordingly. Please make a backup of the
           "/etc/inputrc" or "~/.inputrc" and edit them. Quite often harmless changes like uppercasing or
           lowercasing some arguments solves the problem.

       10) Some authors have strange characters in their names.

           Internally CPAN.pm uses the UTF-8 charset. If your terminal is expecting ISO-8859-1 charset, a
           converter can be activated by setting term_is_latin to a true value in your config file. One way
           of doing so would be

               cpan> o conf term_is_latin 1

           If other charset support is needed, please file a bug report against CPAN.pm at rt.cpan.org and
           describe your needs. Maybe we can extend the support or maybe UTF-8 terminals become widely
           available.

           Note: this config variable is deprecated and will be removed in a future version of CPAN.pm. It
           will be replaced with the conventions around the family of $LANG and $LC_* environment variables.

       11) When an install fails for some reason and then I correct the error condition and retry, CPAN.pm
           refuses to install the module, saying "Already tried without success".

           Use the force pragma like so

             force install Foo::Bar

           Or you can use

             look Foo::Bar

           and then "make install" directly in the subshell.

       12) How do I install a "DEVELOPER RELEASE" of a module?

           By default, CPAN will install the latest non-developer release of a module. If you want to
           install a dev release, you have to specify the partial path starting with the author id to the
           tarball you wish to install, like so:

               cpan> install KWILLIAMS/Module-Build-0.27_07.tar.gz

           Note that you can use the "ls" command to get this path listed.

       13) How do I install a module and all its dependencies from the commandline, without being prompted
           for anything, despite my CPAN configuration (or lack thereof)?

           CPAN uses ExtUtils::MakeMaker's prompt() function to ask its questions, so if you set the
           PERL_MM_USE_DEFAULT environment variable, you shouldn't be asked any questions at all (assuming
           the modules you are installing are nice about obeying that variable as well):

               % PERL_MM_USE_DEFAULT=1 perl -MCPAN -e 'install My::Module'

       14) How do I create a Module::Build based Build.PL derived from an ExtUtils::MakeMaker focused
           Makefile.PL?

           http://search.cpan.org/dist/Module-Build-Convert/

       15) I'm frequently irritated with the CPAN shell's inability to help me select a good mirror.

           CPAN can now help you select a "good" mirror, based on which ones have the lowest 'ping' round-trip roundtrip
           trip times.  From the shell, use the command 'o conf init urllist' and allow CPAN to
           automatically select mirrors for you.

           Beyond that help, the urllist config parameter is yours. You can add and remove sites at will.
           You should find out which sites have the best up-to-dateness, bandwidth, reliability, etc. and
           are topologically close to you. Some people prefer fast downloads, others up-to-dateness, others
           reliability.  You decide which to try in which order.

           Henk P. Penning maintains a site that collects data about CPAN sites:

             http://www.cs.uu.nl/people/henkp/mirmon/cpan.html

           Also, feel free to play with experimental features. Run

             o conf init randomize_urllist ftpstats_period ftpstats_size

           and choose your favorite parameters. After a few downloads running the "hosts" command will
           probably assist you in choosing the best mirror sites.

       16) Why do I get asked the same questions every time I start the shell?

           You can make your configuration changes permanent by calling the command "o conf commit".
           Alternatively set the "auto_commit" variable to true by running "o conf init auto_commit" and
           answering the following question with yes.

       17) Older versions of CPAN.pm had the original root directory of all tarballs in the build directory.
           Now there are always random characters appended to these directory names. Why was this done?

           The random characters are provided by File::Temp and ensure that each module's individual build
           directory is unique. This makes running CPAN.pm in concurrent processes simultaneously safe.

       18) Speaking of the build directory. Do I have to clean it up myself?

           You have the choice to set the config variable "scan_cache" to "never". Then you must clean it up
           yourself. The other possible values, "atstart" and "atexit" clean up the build directory when you
           start or exit the CPAN shell, respectively. If you never start up the CPAN shell, you probably
           also have to clean up the build directory yourself.

COMPATIBILITY
   OLD PERL VERSIONS
       CPAN.pm is regularly tested to run under 5.004, 5.005, and assorted newer versions. It is getting
       more and more difficult to get the minimal prerequisites working on older perls. It is close to
       impossible to get the whole Bundle::CPAN working there. If you're in the position to have only these
       old versions, be advised that CPAN is designed to work fine without the Bundle::CPAN installed.

       To get things going, note that GBARR/Scalar-List-Utils-1.18.tar.gz is compatible with ancient perls
       and that File::Temp is listed as a prerequisite but CPAN has reasonable workarounds if it is missing.

   CPANPLUS
       This module and its competitor, the CPANPLUS module, are both much cooler than the other. CPAN.pm is
       older. CPANPLUS was designed to be more modular, but it was never intended to be compatible with
       CPAN.pm.

   CPANMINUS
       In the year 2010 App::cpanminus was launched as a new approach to a cpan shell with a considerably
       smaller footprint. Very cool stuff.

SECURITY ADVICE
       This software enables you to upgrade software on your computer and so is inherently dangerous because
       the newly installed software may contain bugs and may alter the way your computer works or even make
       it unusable. Please consider backing up your data before every upgrade.

BUGS
       Please report bugs via <http://rt.cpan.org/>

       Before submitting a bug, please make sure that the traditional method of building a Perl module
       package from a shell by following the installation instructions of that package still works in your
       environment.

AUTHOR
       Andreas Koenig "<andk@cpan.org>"

LICENSE
       This program is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.

       See <http://www.perl.com/perl/misc/Artistic.html>

TRANSLATIONS
       Kawai,Takanori provides a Japanese translation of a very old version of this manpage at
       <http://homepage3.nifty.com/hippo2000/perltips/CPAN.htm>

SEE ALSO
       Many people enter the CPAN shell by running the cpan utility program which is installed in the same
       directory as perl itself. So if you have this directory in your PATH variable (or some equivalent in
       your operating system) then typing "cpan" in a console window will work for you as well. Above that
       the utility provides several commandline shortcuts.



perl v5.16.2                                     2012-10-25                                        CPAN(3pm)

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