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I mean like if I wanted to ask 'how do I install a module with cpanp' would that be ok? obviously questions about how do I write a cpan module are offtopic and better relegated to SO.
There is bound to be overlap here, but the implications of using CPAN on your nix system seem like something worth discussing here.
I think this might be something for (say) stackoverflow. CPAN and Perl are not *nix specific.
If you're installing onto a Unix system I think it's on topic just like a question about "ls" is on topic.