> All it's doing is creating a plaintext file with minor changes from
> the original plaintext file. It seems like exactly the sort of thing
> that "awk" is designed for.

Or sometimes just sh.
With care (and careful use of exec) you can write multiple output
files and switch the input file.

The main thing to avoid (because it kills performance) is running
any programs...

	David

-- 
David Laight: david@l8s.co.uk