cpanm是安装Perl模块的最方便的方法。自动下载安装依赖包。使用CPAN shell或下载源码包安装模块，遇到大量依赖关系，非常头痛。下面就是一例：
安装MongoDB模块
复制代码 代码如下:
# perl Makefile.PL
Warning: prerequisite Class::Method::Modifiers 0 not found.
Warning: prerequisite Data::Types 0 not found.
Warning: prerequisite DateTime 0 not found.
Warning: prerequisite DateTime::Tiny 0 not found.
Warning: prerequisite ExtUtils::MakeMaker 6.59 not found. We have 6.30.
Warning: prerequisite File::Slurp 0 not found.
Warning: prerequisite File::Temp 0.17 not found. We have 0.16.
Warning: prerequisite JSON 0 not found.
Warning: prerequisite Moose 0 not found.
Warning: prerequisite Test::Exception 0 not found.
Warning: prerequisite Test::Warn 0 not found.
Warning: prerequisite Tie::IxHash 0 not found.
Warning: prerequisite Try::Tiny 0 not found.
Warning: prerequisite boolean 0 not found.
Writing Makefile for MongoDB
1. 安装cpanm
cpanm其实是一个可执行文件而已。将它下载到bin目录，然后添加执行权限就可以了。
复制代码 代码如下:
# wget http:
//xrl.us/cpanm -O /usr/bin/cpanm; chmod +x /usr/bin/cpanm
2. 使用cpanm安装模块
复制代码 代码如下:
# cpanm -h
-v,–verbose Turns on chatty output
-q,–quiet Turns off the most output
–interactive 开启交互配置(required for Task:: modules)
-f,–force 强制安装
-n,–notest Do not run unit tests
–test-only 只测试不安装
-S,–sudo sudo to run install commands
–installdeps 只安装依赖模块
–showdeps 只显示依赖信息
–reinstall 重新安装
–mirror 指定镜像url (e.g. http://cpan.cpantesters.org/)
–mirror-only 只从镜像下载
–prompt Prompt when configure/build/test fails
-l,–local-lib Specify the install base to install modules
-L,–local-lib-contained Specify the install base to install all non-core modules
–self-contained Install all non-core modules, even if they’re already installed.
–auto-cleanup Number of days that cpanm’s work directories expire in. Defaults to 7
Examples:
cpanm Test::More # install Test::More
cpanm MIYAGAWA/Plack-0.99_05.tar.gz # full distribution path
cpanm http://example.org/LDS/CGI.pm-3.20.tar.gz # install from URL
cpanm ~/dists/MyCompany-Enterprise-1.00.tar.gz # install from a local file
cpanm –interactive Task::Kensho # Configure interactively
cpanm . # install from local directory
cpanm –installdeps . # install all the deps for the current directory
cpanm -L extlib Plack # install Plack and all non-core deps into extlib
cpanm –mirror http://cpan.cpantesters.org/ DBI # use the fast-syncing mirror
