find . -type f -not -name '*.html' -maxdepth 1 -print | xargs rm -rf;

The above only launches three processes (well, actually a few more if xargs decides there are too many files), and since it's I/O bound, I doubt a Perl based solution would be significantly faster (and personally, my wager is that it would be slower).

However, I agree that shell scripting would be slower in general than Perl, for the reason of process creation. But I don't think this case counts.

Ciao,
Gryn :)

In reply to I agree, honest. by gryng
in thread List non-matching files by fundflow

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