App::cpanminus(3)     User Contributed Perl Documentation    App::cpanminus(3)

       App::cpanminus - get, unpack, build and install modules from CPAN

           cpanm Module

       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

       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 | 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 local::lib.

   Installing to local perl (perlbrew, plenv etc.)
       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 just do:

           curl -L | 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

           cd ~/bin
           curl -L -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

   Troubleshoot: HTTPS warnings
       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, ""

       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.

       •   make

       •   Module::Build (core in 5.10)

   How does cpanm get/parse/update the CPAN index?
       It queries the CPAN Meta DB site at <>.
       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 <> 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 with cpanm, and read more about the privacy policy about
       this data collection at <>

       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").

       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

       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.

   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 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.

   Does cpanm support the feature XYZ of CPAN and CPANPLUS?
       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 mentioned.

       •   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 do :)

       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 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.

       <> - source code repository, issue
       <irc://> - discussions about cpanm and its related

       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 v5.28.1                      2016-05-24                 App::cpanminus(3)