Clunch protection

[Arthur David Olson]

At the top of "sh" files in the "rn" distribution this line was included:

	export PATH || (echo "You didn't use sh, you clunch." ; kill \$\$)

This was designed to ensure that if someone ran "csh" over the script
things would come to a screeching halt.

Seeing it set me to thinking...what if, instead of that line, this appeared:

	export PATH || exec sh $0

You'd get the protection without requiring the user to retype the command.

You could even go so far as to:

	( : oops >& /dev/null ) || exec sh $0

to avoid the both the generation of a diagnostic message and the possibility
of mishap if someone had created an executable program named "export".

Well friends, how about it?  Such protection might make folks lives easier.
Is it worthwhile?  Is there a better way to do it?  Mail me your responses;
if there's sufficient volume, I'll summarize them in a followup article.
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