cpanm是安裝Perl模塊的最方便的方法。自動下載安裝依賴包。使用CPAN shell或下載源碼包安裝模塊，遇到大量依賴關系，非常頭痛。下面就是一例：

安裝MongoDB模塊

代碼如下:
# 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. 安裝cpanm

cpanm其實是一個可執行文件而已。將它下載到bin目錄，然后添加執行權限就可以了。

代碼如下:
# wget http:
//xrl.us/cpanm -O /usr/bin/cpanm; chmod +x /usr/bin/cpanm

2. 使用cpanm安裝模塊

代碼如下:
# cpanm -h
  -v,--verbose              Turns on chatty output
  -q,--quiet                Turns off the most output
  --interactive             開啟交互配置(required for Task:: modules)
  -f,--force                強制安裝
  -n,--notest               Do not run unit tests
  --test-only               只測試不安裝
  -S,--sudo                 sudo to run install commands
  --installdeps             只安裝依賴模塊
  --showdeps                只顯示依賴信息
  --reinstall               重新安裝
  --mirror                  指定鏡像url (e.g. http://cpan.cpantesters.org/)
  --mirror-only             只從鏡像下載
  --prompt                  Prompt when configure/build/test fails