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Enter the perl CPAN shell:
perl -MCPAN -e shell
List installed module versions:
perl -MCPAN -e 'CPAN::Shell->r'
List installed module versions (from inside the shell):
Good tips on using CPAN: http://sial.org/howto/perl/life-with-cpan/
Installing through CPAN is dangerous because it doesn't have an uninstall command and modules you install are not registered in a package manager (and therefore can only be removed manually). Use
cpan2rpm to create RPMs from CPAN modules: http://perl.arix.com/cpan2rpm/
# rpm -Uvh ~alan/cpan2rpm-2.028-1.noarch.rpm