Perl

CPAN - Perl Packages

First time launch:

$ cpan                                       # ... OR ...
$ perl -MCPAN -e shell                       #  --> yes auto config

To adapt config related to proxy:

cpan> o config init /proxy/                  # (to enter an empty string, simply enter 1 space char as a value)
cpan> o conf commit

To install a Perl package (eg. here package GetOpt::Long):

$ cpan
cpan>install GetOpt::Long

Editing the configruation:

cpan> o conf init                            # Reset the configuration
cpan> o conf http_proxy http://proxy:8080/   # Edit a given variable (eg. here changing proxy settings):
cpan> o conf commit                          # To commit changes in the configuration
cpan> o                                      # to get o options
cpan> o conf                                 # To get o conf option

To edit CPAN database url:

cpan> o conf /urllist/
cpan> o conf init /urllist/
cpan> o conf urllist shift
cpan> o conf urllist unshift ftp://my.new.site/
cpan> o conf commit

To update CPAN itself:

cpan> install Bundle::CPAN
cpan> reload cpan