The standard answer, given by Larry himself, is "Filter the shell script through Tom Christiansen." Which means that there isn't a nice converter. There may be nasty converters that I'm unaware of, but ... I'm unaware of them. :) Good luck.

UPDATE:
I couldn't find the quote to properly attribute it, but perldoc seems to know all. :)

%perldoc -q shell script

Found in /System/Library/Perl/pods/perlfaq8.pod

How can I convert my shell script to perl?

Learn Perl and rewrite it. Seriously, there's no simple converter. Things that are awkward to do in the shell are easy to do in Perl, and this very awkwardness is what would make a shell->perl converter nigh-on impossible to write. By rewriting it, you'll think about what you're really trying to do, and hopefully will escape the shell's pipeline datastream paradigm, which while convenient for some matters, causes many inefficiencies.

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