plenv is to perlbrew what rbenv is to RVM. If you’re satisfied with perlbrew there’s no reason that you must switch to plenv, but i did it earlier this year, and I’m happy with the switch. Benefits plenv is written entirely in bash (except perl-build, the part which downloads perl tarballs from PAUSE and apply patchperl), and provides “shims” in your PATH that locates the right executable of your