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Or even 'ag' (the silver searcher). Like ack, but "better". https://github.com/ggreer/the_silver_searcher

"better" or just faster since its written in C ?

It is not a drop-in replacement for ack. e.g. there are some basic usages it does not support -- iirc counts (ag -c pattern).

Eh, faster is faster, does it matter why?

The part about written in C was just added on. My point was "better or faster". If you say "faster is better" I'll have to agree :)