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 else.
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.
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.
You can also use the latest cpanminus to install cpanminus itself:
curl -L https://cpanmin.us | perl - --sudo App::cpanminus
This will install "cpanm" to your bin directory like
"/usr/local/bin" and you'll need the "--sudo" option to
write to the directory, unless you configured "INSTALL_BASE" with
If you have perl in your home directory, which is the case if you use tools like
perlbrew or plenv, 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
curl -L https://cpanmin.us | perl - App::cpanminus
to install the "cpanm" executable to the perl's bin path, like
You can also copy the standalone executable to whatever location you'd like.
curl -L https://cpanmin.us/ -o cpanm
chmod +x cpanm
This just works, but be sure to grab the new version manually when you upgrade
because "--self-upgrade" might not work with this installation
When you run "curl" commands above, you may encounter SSL handshake
errors or certification warnings. This is due to your HTTP client (curl) being
old, or SSL certificates installed on your system needs to be updated.
You're recommended to update the software or system if you can. If that is
impossible or difficult, use the "-k" option with curl or an
alternative URL, "https://git.io/cpanm"
perl 5.8.1 or later.
- 'tar' executable (bsdtar or GNU tar version 1.22 are recommended) or
Archive::Tar to unpack files.
- C compiler, if you want to build XS modules.
- Module::Build (core in 5.10)
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 search API.
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
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.
It installs to wherever ExtUtils::MakeMaker and Module::Build are configured to
(via "PERL_MM_OPT" and "PERL_MB_OPT").
By default, it installs to the site_perl directory that belongs to your perl.
You can see the locations for that by running "perl -V" and it will
be likely something under "/opt/local/perl/..." if you're using
system perl, or under your home directory if you have built perl yourself
using perlbrew or plenv.
If you've already configured local::lib on your shell, cpanm respects that
settings and modules will be installed to your local perl5 directory.
At a boot time, cpanminus checks whether you have already configured local::lib,
or have a permission to install modules to the site_perl directory. If
neither, i.e. you're using system perl and do not run cpanm as a root, it
automatically sets up local::lib compatible installation path in a
"perl5" directory under your home directory.
To avoid this, run "cpanm" either as a root user, with
"--sudo" option, or with "--local-lib" option.
It is more likely a problem with the distribution itself. cpanminus doesn't
support or may have issues with distributions such as follows:
- Tests that require input from STDIN.
- Build.PL or Makefile.PL that prompts for input even when
"PERL_MM_USE_DEFAULT" is enabled.
- Modules that have invalid numeric values as VERSION (such as
These failures can be reported back to the author of the module so that they can
fix it accordingly, rather than to cpanminus.
Most likely not. Here are the things that cpanm doesn't do by itself.
If you need these features, use CPAN, CPANPLUS or the standalone tools that are
- CPAN testers reporting. See App::cpanminus::reporter
- Building RPM packages from CPAN modules
- Listing the outdated modules that needs upgrading. See
- Showing the changes of the modules you're about to upgrade. See
- Patching CPAN modules with distroprefs.
See cpanm or "cpanm -h" to see what cpanminus can
Copyright 2010- Tatsuhiko Miyagawa
The standalone executable contains the following modules embedded.
- CPAN::DistnameInfo Copyright 2003 Graham Barr
- 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
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,
- <irc://irc.perl.org/#cpanm> - discussions about cpanm and its
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