McGruber writes: Dublin-based writer Leo Traynor (traynorseye.com) has written a piece about confronting the troll who drove him off Twitter, hacked his Facebook, and abused and terrified his family. The piece is posted on his own site (http://www.traynorseye.com/) and at the Guardian (http://www.guardian.co.uk/commentisfree/2012/sep/26/day-confronted-troll)
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals