App::cpanminus(3) User Contributed Perl Documentation App::cpanminus(3)
App::cpanminus - get, unpack, build and install modules from CPAN
Run "cpanm -h" or "perldoc cpanm" for more options.
cpanminus is a script to get, unpack, build and install modules from CPAN and does nothing
It's dependency free (can bootstrap itself), requires zero configuration, and stands
alone. When running, it requires only 10MB of RAM.
There are several ways to install cpanminus to your system.
Package management system
There are Debian packages, RPMs, FreeBSD ports, and packages for other operation systems
available. If you want to use the package management system, search for cpanminus and use
the appropriate command to install. This makes it easy to install "cpanm" to your system
without thinking about where to install, and later upgrade.
Installing to system perl
You can also use the latest cpanminus to install cpanminus itself:
curl -L http://cpanmin.us | perl - --sudo App::cpanminus
This will install "cpanm" to your bin directory like "/usr/local/bin" (unless you
configured "INSTALL_BASE" with local::lib), so you probably need the "--sudo" option.
Installing to local perl (perlbrew)
If you have perl in your home directory, which is the case if you use tools like perlbrew,
you don't need the "--sudo" option, since you're most likely to have a write permission to
the perl's library path. You can just do:
curl -L http://cpanmin.us | perl - App::cpanminus
to install the "cpanm" executable to the perl's bin path, like
Downloading the standalone executable
You can also copy the standalone executable to whatever location you'd like.
curl -LO http://xrl.us/cpanm
chmod +x cpanm
# edit shebang if you don't have /usr/bin/env
This just works, but be sure to grab the new version manually when you upgrade because
"--self-upgrade" might not work for this.
perl 5.8 or later.
o 'tar' executable (bsdtar or GNU tar version 1.22 are recommended) or Archive::Tar to
o C compiler, if you want to build XS modules.
o Module::Build (core in 5.10)
Another CPAN installer?
OK, the first motivation was this: the CPAN shell runs out of memory (or swaps heavily and
gets really slow) on Slicehost/linode's most affordable plan with only 256MB RAM. Should I
pay more to install perl modules from CPAN? I don't think so.
But why a new client?
First of all, let me be clear that CPAN and CPANPLUS are great tools I've used for
literally years (you know how many modules I have on CPAN, right?). I really respect their
efforts of maintaining the most important tools in the CPAN toolchain ecosystem.
However, for less experienced users (mostly from outside the Perl community), or even
really experienced Perl developers who know how to shoot themselves in their feet, setting
up the CPAN toolchain often feels like yak shaving, especially when all they want to do is
just install some modules and start writing code.
Zero-conf? How does this module get/parse/update the CPAN index?
It queries the CPAN Meta DB site at <http://cpanmetadb.plackperl.org/>. The site is
updated at least every hour to reflect the latest changes from fast syncing mirrors. The
script then also falls back to query the module at <http://metacpan.org/> using its
Upon calling these API hosts, cpanm (1.6004 or later) will send the local perl versions to
the server in User-Agent string by default. You can turn it off with
"--no-report-perl-version" option. Read more about the option with cpanm, and read more
Fetched files are unpacked in "~/.cpanm" and automatically cleaned up periodically. You
can configure the location of this with the "PERL_CPANM_HOME" environment variable.
Where does this install modules to? Do I need root access?
It installs to wherever ExtUtils::MakeMaker and Module::Build are configured to (via
"PERL_MM_OPT" and "PERL_MB_OPT"). So if you're using local::lib, then it installs to your
local perl5 directory. Otherwise it installs to the site_perl directory that belongs to
cpanminus at a boot time checks whether you have configured local::lib, or have the
permission to install modules to the site_perl directory. If neither, it automatically
sets up local::lib compatible installation path in a "perl5" directory under your home
directory. To avoid this, run the script as the root user, with "--sudo" option or with
cpanminus can't install the module XYZ. Is it a bug?
It is more likely a problem with the distribution itself. cpanminus doesn't support or is
known to have issues with distributions like as follows:
o Tests that require input from STDIN.
o Tests that might fail when "AUTOMATED_TESTING" is enabled.
o Modules that have invalid numeric values as VERSION (such as "1.1a")
These failures can be reported back to the author of the module so that they can fix it
accordingly, rather than me.
Does cpanm support the feature XYZ of CPAN and CPANPLUS?
Most likely not. Here are the things that cpanm doesn't do by itself. And it's a feature -
you got that from the name minus, right?
If you need these features, use CPAN, CPANPLUS or the standalone tools that are mentioned.
o CPAN testers reporting
o Building RPM packages from CPAN modules
o Listing the outdated modules that needs upgrading. See App::cpanoutdated
o Showing the changes of the modules you're about to upgrade. See cpan-listchanges
o Patching CPAN modules with distroprefs.
See cpanm or "cpanm -h" to see what cpanminus can do :)
Copyright 2010- Tatsuhiko Miyagawa
The standalone executable contains the following modules embedded.
CPAN::DistnameInfo Copyright 2003 Graham Barr
Parse::CPAN::Meta Copyright 2006-2009 Adam Kennedy
local::lib Copyright 2007-2009 Matt S Trout
HTTP::Tiny Copyright 2011 Christian Hansen
Module::Metadata Copyright 2001-2006 Ken Williams. 2010 Matt S Trout
version Copyright 2004-2010 John Peacock
JSON::PP Copyright 2007-2011 by Makamaka Hannyaharamitu
CPAN::Meta, CPAN::Meta::Requirements Copyright (c) 2010 by David Golden and Ricardo Signes
CPAN::Meta::YAML Copyright 2010 Adam Kennedy
File::pushd Copyright 2012 David Golden
This software is licensed under the same terms as Perl.
Patches and code improvements were contributed by:
Goro Fuji, Kazuhiro Osawa, Tokuhiro Matsuno, Kenichi Ishigaki, Ian Wells, Pedro Melo,
Masayoshi Sekimura, Matt S Trout (mst), squeeky, horus and Ingy dot Net.
Bug reports, suggestions and feedbacks were sent by, or general acknowledgement goes to:
Jesse Vincent, David Golden, Andreas Koenig, Jos Boumans, Chris Williams, Adam Kennedy,
Audrey Tang, J. Shirley, Chris Prather, Jesse Luehrs, Marcus Ramberg, Shawn M Moore,
chocolateboy, Chirs Nehren, Jonathan Rockway, Leon Brocard, Simon Elliott, Ricardo Signes,
AEvar Arnfjord Bjarmason, Eric Wilhelm, Florian Ragwitz and xaicron.
<http://github.com/miyagawa/cpanminus> - source code repository, issue tracker
<irc://irc.perl.org/#toolchain> - discussions about Perl toolchain. I'm there.
This software is provided "as-is," without any express or implied warranty. In no event
shall the author be held liable for any damages arising from the use of the software.
CPAN CPANPLUS pip
perl v5.16.3 2013-06-19 App::cpanminus(3)