Corona688 has already said it: throw away your originals only after being 101% sure your results are what they are supposed to be.

Once you are indeed sure you want to replace your originals use "mv" to move the results over the originals:

Code:

find /some/path/to/start -type f -name "*new" -print | while read file
     mv $file ${file%???}
done

This moves all files which names end in "new" to the same name less "new", i.e. "filenamenew" -> "filename".

I hope this helps.

bakunin