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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 [-cfgimtTw] module_name [ module_name ... ]

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

# without arguments, starts CPAN.pm shell

# force install modules (usually those that fail tests)
cpan -f module_name [ module_name ... ]

# install modules but without testing them
cpan -T module_name [ module_name ... ]

# dump the configuration
cpan -J

# load a different configuration to install Module::Foo
cpan -j some/other/file Module::Foo

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


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.

-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.

-I Load "local::lib" (think like "-I" for loading lib paths).

-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.

-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


There are several components in CPAN.pm 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:

"cpan" splits this variable on whitespace and prepends that list to @ARGV before
it processes the command-line arguments. For instance, if you always want to use
"local:lib", you can set "CPAN_OPTS" to "-I".

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

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 false).

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).


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

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