Provided by: libperl5.28_5.28.1-6build1_amd64 bug


       cpan - easily interact with CPAN from the command line


               # with arguments and no switches, installs specified modules
               cpan module_name [ module_name ... ]

               # with switches, installs modules with extra behavior
               cpan [-cfFimtTw] module_name [ module_name ... ]

               # use local::lib
               cpan -I module_name [ module_name ... ]

               # one time mirror override for faster mirrors
               cpan -p ...

               # with just the dot, install from the distribution in the
               # current directory
               cpan .

               # without arguments, starts shell

               # without arguments, but some switches
               cpan [-ahpruvACDLOPX]


       This script provides a command interface (not a shell) to CPAN. At the moment it uses to do the work, but it is not a one-shot command runner for

       -a  Creates a autobundle with CPAN::Shell->autobundle.

       -A module [ module ... ]
           Shows the primary maintainers for the specified modules.

       -c module
           Runs a `make clean` in the specified module's directories.

       -C module [ module ... ]
           Show the Changes files for the specified modules

       -D module [ module ... ]
           Show the module details. This prints one line for each out-of-date module (meaning,
           modules locally installed but have newer versions on CPAN).  Each line has three
           columns: module name, local version, and CPAN version.

       -f  Force the specified action, when it normally would have failed. Use this to install a
           module even if its tests fail. When you use this option, -i is not optional for
           installing a module when you need to force it:

                   % cpan -f -i Module::Foo

       -F  Turn off's attempts to lock anything. You should be careful with this since
           you might end up with multiple scripts trying to muck in the same directory. This
           isn't so much of a concern if you're loading a special config with "-j", and that
           config sets up its own work directories.

       -g module [ module ... ]
           Downloads to the current directory the latest distribution of the module.

       -G module [ module ... ]

           Download to the current directory the latest distribution of the modules, unpack each
           distribution, and create a git repository for each distribution.

           If you want this feature, check out Yanick Champoux's "Git::CPAN::Patch" distribution.

       -h  Print a help message and exit. When you specify "-h", it ignores all of the other
           options and arguments.

       -i module [ module ... ]
           Install the specified modules. With no other switches, this switch is implied.

       -I  Load "local::lib" (think like "-I" for loading lib paths). Too bad "-l" was already

           Load the file that has the CPAN configuration data. This should have the same format
           as the standard CPAN/ file, which defines $CPAN::Config as an anonymous hash.

       -J  Dump the configuration in the same format that uses. This is useful for
           checking the configuration as well as using the dump as a starting point for a new,
           custom configuration.

       -l  List all installed modules with their versions

       -L author [ author ... ]
           List the modules by the specified authors.

       -m  Make the specified modules.

       -M mirror1,mirror2,...
           A comma-separated list of mirrors to use for just this run. The "-P" option can find
           them for you automatically.

       -n  Do a dry run, but don't actually install anything. (unimplemented)

       -O  Show the out-of-date modules.

       -p  Ping the configured mirrors and print a report

       -P  Find the best mirrors you could be using and use them for the current session.

       -r  Recompiles dynamically loaded modules with CPAN::Shell->recompile.

       -s  Drop in the shell. This command does this automatically if you don't specify
           any arguments.

       -t module [ module ... ]
           Run a `make test` on the specified modules.

       -T  Do not test modules. Simply install them.

       -u  Upgrade all installed modules. Blindly doing this can really break things, so keep a

       -v  Print the script version and version then exit.

       -V  Print detailed information about the cpan client.


           Turn on cpan warnings. This checks various things, like directory permissions, and
           tells you about problems you might have.

       -x module [ module ... ]
           Find close matches to the named modules that you think you might have mistyped. This
           requires the optional installation of Text::Levenshtein or Text::Levenshtein::Damerau.

       -X  Dump all the namespaces to standard output.

               # print a help message
               cpan -h

               # print the version numbers
               cpan -v

               # create an autobundle
               cpan -a

               # recompile modules
               cpan -r

               # upgrade all installed modules
               cpan -u

               # install modules ( sole -i is optional )
               cpan -i Netscape::Booksmarks Business::ISBN

               # force install modules ( must use -i )
               cpan -fi CGI::Minimal URI

               # install modules but without testing them
               cpan -Ti CGI::Minimal URI

   Environment variables
       There are several components in that use environment variables.  The build tools,
       ExtUtils::MakeMaker and Module::Build use some, while others matter to the levels above
       them. Some of these are specified by the Perl Toolchain Gang:

       Lancaster Concensus:

       Oslo Concensus:

           Assume no one is paying attention and skips prompts for distributions that do that
           correctly. cpan(1) sets this to 1 unless it already has a value (even if that value is

           Use the default answer for a prompted questions. cpan(1) sets this to 1 unless it
           already has a value (even if that value is false).

           As with "PERL5OPTS", a string of additional cpan(1) options to add to those you
           specify on the command line.

           The log level to use, with either the embedded, minimal logger or Log::Log4perl if it
           is installed. Possible values are the same as the "Log::Log4perl" levels: "TRACE",
           "DEBUG", "INFO", "WARN", "ERROR", and "FATAL". The default is "INFO".

           The path to the "git" binary to use for the Git features. The default is


       The script exits with zero if it thinks that everything worked, or a positive number if it
       thinks that something failed. Note, however, that in some cases it has to divine a failure
       by the output of things it does not control. For now, the exit codes are vague:

               1       An unknown error

               2       The was an external problem

               4       There was an internal problem with the script

               8       A module failed to install


       * one shot configuration values from the command line


       * none noted


       Most behaviour, including environment variables and configuration, comes directly from


       This code is in Github in the repository:


       The source used to be tracked separately in another GitHub repo, but the canonical source
       is now in the above repo.


       Japheth Cleaver added the bits to allow a forced install (-f).

       Jim Brandt suggest and provided the initial implementation for the up-to-date and Changes

       Adam Kennedy pointed out that exit() causes problems on Windows where this script ends up
       with a .bat extension


       brian d foy, "<>"


       Copyright (c) 2001-2015, brian d foy, All Rights Reserved.

       You may redistribute this under the same terms as Perl itself.