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IIRC The perl5.8 from http://sunfreeware.com installs in /usr/local, so all exising scripts that use /usr/bin/perl will continue working as is.
Well you can install 5.8 over 5.005, but then you'd better be sure everything keeps working. I don't know if it will.
Use 5.003 just specifies the minumum perl version, it does not alter the behaviour of the perl interpreter in perl 5. Perl6 might, though.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

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