Rob Pike: /bin/true used to be an empty file
twitter.com
twitter.com
See also http://trillian.mit.edu/~jc/humor/ATT_Copyright_true.html , with about 80 HN comments https://hn.algolia.com/?query=%2Fbin%2Ftrue%20command&sort=b... .
Keeping things as simple as possible is a bit of a losing battle.