cpan>

# to install Some::Module just type:
cpan> install Some::Module

# to see if there are updates for a module use 'r'
cpan> r DBI
...
Package namespace         installed    latest  in CPAN file
DBI                           1.637     1.643  TIMB/DBI-1.643.tar.gz

# to upgrade some module to the latest version use 'upgrade'
cpan> upgrade DBI