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App::Cpan(3perl)                 Perl Programmers Reference Guide                App::Cpan(3perl)

       App::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 ... ]

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

               # without arguments, starts CPAN.pm shell

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

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

       -a  Creates a CPAN.pm 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 This prints one line for each out-of-date module (meaning,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 CPAN.pm'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  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

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

       -J  Dump the configuration in the same format that CPAN.pm 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.

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

       -O  Show the out-of-date modules.

       -p  Ping the configured mirrors

       -P  Find the best mirrors you could be using (but doesn't configure them just yet)

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

       -t  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 CPAN.pm 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.

               # 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

           Just do it.

           The "run" method returns 0 on success and a positive number on failure. See the
           section on EXIT CODES for details on the values.

           CPAN.pm sends all the good stuff either to STDOUT, or to a temp file if
           $CPAN::Be_Silent is set. I have to intercept that output so I can find out what

           Stolen from File::Path::Expand

       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

       * There is initial support for Log4perl if it is available, but I haven't gone through
       everything to make the NullLogger work out correctly if Log4perl is not installed.

       * When I capture CPAN.pm output, I need to check for errors and report them to the user.

       * Support local::lib

       * Warnings switch

       * Check then exit

       * ping mirrors support

       * no test option

       * none noted

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

       This code is in Github:


       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

       David Golden helps integrate this into the "CPAN.pm" repos.

       brian d foy, "<bdfoy AT cpan.org>"

       Copyright (c) 2001-2013, brian d foy, All Rights Reserved.

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

perl v5.20.2                                2018-06-10                           App::Cpan(3perl)

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