Attributed to Hopper, without source, in The UNIX-HATERS Handbook (1994), edited by Simson Garfinkel, Daniel Weise, and Steven Strassmann , p. 9, this is most commonly attributed to Andrew Tanenbaum, as it appears in his book Computer Networks (1981), p. 168, but has also been attributed to Patricia Seybold and Ken Olsen.https://en.wikiquote.org/wiki/Grace_Hopper