From:http://blog.sina.com.cn/s/blog_49432699010149yz.html

CPAN method
perl -MCPAN -e shell (to get an interactive CPAN shell)
perl -MCPAN -e 'install Time::JulianDay' (if you know the name of the module, you can install it directly without interacting with the CPAN shell)

tips: 如何检查一个perl模块是否已经安装了？

可以使用perldoc moduleName检查。

不过首先要现安装perl-doc

$sudo apt-get install perl-doc

$ perldoc CGI

Try it with a module that does not exist and you’ll get an error message.

$ perldoc Llamas

$ No documentation found for "Llamas".

最佳实践：使用MCPAN的m moduleName命令

cpan[1]> m DBI

CPAN: Storable loaded ok (v2.20)

Going to read '/home/forrest/.cpan/Metadata'

Database was generated on Wed, 21 Jul 2010 07:35:04 GMT

Module id = DBI

DESCRIPTION Generic Database Interface (see DBD modules)

CPAN_USERID TIMB (Tim Bunce )

CPAN_VERSION 1.612

CPAN_FILE T/TI/TIMB/DBI-1.612.tar.gz

UPLOAD_DATE 2010-07-16

DSLIP_STATUS MmcOp (mature,mailing-list,C,object-oriented,Standard-Perl)

MANPAGE DBI - Database independent interface for Perl

INST_FILE /usr/local/lib/perl/5.10.1/DBI.pm

INST_VERSION 1.612

cpan[2]> m DBD::Oracle

Module id = DBD::Oracle

DESCRIPTION Oracle Driver for DBI

CPAN_USERID DBIML (DBI Mailing Lists )

CPAN_VERSION 1.24

CPAN_FILE P/PY/PYTHIAN/DBD-Oracle-1.24b.tar.gz

DSLIP_STATUS MmcO? (mature,mailing-list,C,object-oriented,)

INST_FILE (not installed)

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Perl module CPAN

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