This was very helpful. For my original question, a rejoinder surely could have been "Why don't you just try it and see how it works out?" I did that - I grabbed a test program that I'd built and started modifying it, playing with it, calling it with different args. But the results I was getting made no sense - the paths I put in PERL5LIB weren't showing up in INC. So eventually I just asked a question.

Yes, the test program I grabbed used taint.

wisdom is slowly dawning
throop

In reply to Re^3: Paths for PERL5LIB, the -I switch and 'use lib' by throop
in thread Paths for PERL5LIB, the -I switch and 'use lib' by throop

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