wc -l *.cpp *.h? :)

Seriously, what are the restrictions? Counting or not counting comments? Blank lines? Are you going to penalize one developer over another because one does

if(a) 
{
   do_this();
}
[download]

and another does

if(a) do_this();
[download]

?

You probably want to go over to freshmeat.net and type "metrics". That'll find you things like CCCC, to pick the first result from the list.

I like perl, and I do a lot of things with it, but this isn't a wheel I'd chose to reinvent.
--
Mike