On Mon, 17 Jan 2011, Jeremy C. Reed wrote:
It was introduced into BSD by April 1981. For 2BSD
(2.8) it was added by
Dec. 16, 1981 when built with MENLO_SCRIPT defined (but I don't see that
documented or defined).
Doing some related research, I noticed I had written in my notes (maybe
over a year ago) that Robert Elz added #! to BSD. Here is the email
message with the background:
http://mail-index.netbsd.org/netbsd-users/2008/11/10/msg002390.html