Norman put this link up on twitter: https://medium.com/@rualthanzauva/grep-was-a-private-command-of-mine-for-quite-a-while-before-i-made-it-public-ken-thompson-a40e24a5ef48#.t94fs3pgx All good, except I'm not sure I would have written "One guy McIlroy claimed grep was invented for him." :-) Cheers, Warren (a lesser guy)