That'd be my other concern. ack is perl, as far as I can tell. I have no idea how perl performs at these tasks. But grep is written in C, and there're fun examp

That'd be my other concern. ack is perl, as far as I can tell. I have no idea how perl performs at these tasks. But grep is written in C, and there're fun examples of how exactly it gets to be so fast (http://ridiculousfish.com/blog/posts/old-age-and-treachery.html http://ridiculousfish.com/blog/posts/old-age-and-treachery.h... comes to mind).