On Sun, 9 Mar 2008, Greg Andrews wrote:

> IIRC, Sun's vi, like /bin/sh, traces its ancestry back to the version
> provided in AT&T's SRV4 Unix almost 20 years ago (1989). Since the
> SVR4 blend of BSD and System V Unixes was a joint project by AT&T and
> Sun (and others), the Solaris vi might even go all the way back to the
> original version created at Berkeley in the late 70s.

Given that vi's original author, Bill Joy, was one of Sun's founders, I
suspect the latter is very probably the case. ;-)

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