[TUHS] First Unix-like OSes not derived from AT&T code?

[Clem Cole]

On Sun, May 1, 2022 at 5:34 AM Andrew Warkentin <andreww591 at gmail.com>
wrote:

> What was the first "clone" functional Unix (i.e. an OS not derived
> from genetic Unix code but highly compatible with genetic Unix)? Idris
> is the earliest such OS of which I am aware (at least AFAIK it's not a
> genetic Unix), but was it actually the first?

I know of none before this that tried to truly 'clone' all the (v6) kernel
functionality and many tools.



> Similarly, which was the
> first "outer Unix-like" system (i.e. one with strong Unix influence
> but significantly incompatible with functional Unix)? Off the top of
> my head the earliest such system I can think of is Thoth (which
> predates Idris by almost 2 years), but again I'm not sure if it was
> actually the first.
>
Thoth Thucks....   [Kelly Booth gave me one of these tee's years go].

Mike Malcolm did not try to clone UNIX - for one thing, it was in B [which
Steve Johnson has spread the gospel of same on his sabbatical).  It was not
until the Thoth rewrite that became QNX that they tried to ensure all of
the Unix behaviors and APIs.  Mike was certainly had an influence by UNIX
and IIRC his thesis and the Thoth papers reference/compare it.

The first non-C style mostly cone was Holt's Tunis in the early 1980-s (in
Euclid IIRC - which is similar to, but different from, Hansen and Wirth's
Concurrent-Pascal).
ᐧ
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