If you are using Red Hat Linux then use up2date command to install most common modules:

# up2date module-name
Use following command to list all supported modules:
# up2date –showall | grep -i ‘perl’
OR use yum command under CentOS/RHEL 5/Fedora core:
# yum list available ‘perl’

If you are using Debian Linux, try to use apt-get command to install common perl module. However following is the recommended way to install a perl module.

A) Start CPAN Shell:
# perl -MCPAN -e shell

B) Install a perl module:
At cpan> shell prompt install module using install module::Name command. For example install module called MIME::Lite:
# cpan> install MIME::Lite
Alternatively, try out the following command:
# cpan -i MIME::Lite