Used this perl command:
$ # perl -pi -e 's/string\.len\((.*?)\)/#\1/g' *.lua
Also fixed one instance where the above command didn't correctly
translate the intended code (string.len(a .. b .. c)).
license" to "Same as Nmap--See http://nmap.org/book/man-legal.html" like
scripts commonly use. I added the field to some modules I know to be under the
Nmap license: bin, datafiles, dns, nmap, unpwdb. I left alone bin, bit, pcre,
and url, which come from outside sources.