The autobundle command of CPAN will create a file that lists all installed modules. If you then edit that file and re"install" that bundle, CPAN will then update all installed modules. Also see App::cpanoutdated respectively cpan-outdated, which should make possible what you want by doing:

cpan-outdated | grep -v -i bz2 | xargs cpan -i
# or, if you have App::cpanminus
cpan-outdated | grep -v -i bz2 | xargs mcpan
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