If I remember correctly, PERLLIB was used on perl4 and when perl5 went out, support for PERL5LIB was added so the user could define different lib paths for both perl4 and perl5 from the same shell/session.

PERLLIB is obsolete, use PERL5LIB

In reply to Re: Motivation behind PERL5LIB and PERLLIB? by salva
in thread Motivation behind PERL5LIB and PERLLIB? by osunderdog

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