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

NAME
       App::Cpan - easily interact with CPAN from the command line

SYNOPSIS
               # 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
               cpan

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

DESCRIPTION
       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.

   Options
       -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 This prints one line for each out-of-date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 ... ]
           UNIMPLEMENTED

           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 taken.

       -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 backup.

       -v  Print the script version and CPAN.pm version then exit.

       -V  Print detailed information about the cpan client.

       -w  UNIMPLEMENTED

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

   Examples
               # 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

   Methods
       run()
           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 happened.

           Stolen from File::Path::Expand

EXIT VALUES
       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

TO DO
       * 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

BUGS
       * none noted

SEE ALSO
       Most behaviour, including environment variables and configuration,
       comes directly from CPAN.pm.

SOURCE AVAILABILITY
       This code is in Github:

               git://github.com/briandfoy/cpan_script.git

CREDITS
       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 features.

       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.

AUTHOR
       brian d foy, "<bdfoy@cpan.org>"

COPYRIGHT
       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                      2018-11-30                  App::Cpan(3perl)

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