in reply to Comparison between Perl and Ksh
Does your manager know that the rest of us have electric lights and horseless carriages now? Maybe this article about Perl versus Tcl is relevant. It talks about Tcl as having typical drawbacks of shell languages. (Note that Tcl has actually improved dramatically since then, but Ksh probably has not.)
UPDATE: This is another article, with more direct discussion of korn shell.
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Seekers of Perl Wisdom