This would depend upon which version of GNU grep one installs... About 10 years ago (when this article was written), I upgraded a RedHat system and discovered t

This would depend upon which version of GNU grep one installs... About 10 years ago (when this article was written), I upgraded a RedHat system and discovered that some of my scripts were running 10 times slower than they had on the previous install. I isolated the issue to grep and benchmarked the grep from the previous release against the current release. The new grep was 10 times slower. I didn't have much more time to waste on the issue so I simply copied the grep binary from the previous release to the new install and everything was fine afterward.