Following this line of thought, - and with the disclaimer that my own personal existence begins roughly where what has been called “The Last True UNIX” [Seventh Edition] ends, I’d say that, if ESR - who I know can be controversial - is correct, “BSD won in the marketplace, but System V won the standards wars” or words to that effect.
With that in mind, and given that NetBSD was forked from 386BSD and in turn gave rise to the other BSDs around today,
That is not true. FreeBSD imported the 386BSD plus patchkit patches into its CVS tree. It did not inport NetBSD's source, though NetBSD did import the same sources into their CVS repo days (or maybe weeks) earlier. Much of this early history, though, is not widely available as the early NetBSD and FreeBSD CVS repos are not available in their original form due to the AT&T lawsuit.
And then the redo of these groups of the 4.4BSD import, the 4.4BSD-lite and lite 2 rebased both projects further muddy the waters since they now were both based on approximately the same pure from CSRG sources, rendering the earlier messiness perhaps moot. Or perhaps not, but not a point that has universal agreement, even among those involved in doing the work.
It also gets muddy because of the original patchkit authors also spintered to for both NetBSD and FreeBSD in a way that's most kindly described as messy, so much spin was broadcast to characterize who was first or best. The truth is that the split was messy and definitive statements around this are troublesome at best.
Warner
it would be my candidate for “most direct descendant available today,” particularly if we’re talking wide availability. (Whilst V1-6 and beyond were of course only available to users of business and academic mainframes and minicomputers, I’d argue that the other two contenders, Solaris and HP-UX, are sufficiently rare in comparison to the availability even of the open source BSD’s that the word “available” would be doing some rather heavy lifting if I were to include them.) The BSDs (except macOS and whatever SCO’s cash cow is called this evening) are also open source, of course, which is inline with the spirit of early Unix.
I’ve not done an audit - and am not qualified to - but I suspect the main objection to this line of thinking is that despite the fact it still runs on VAX, it would not surprise me in the least to find that (excluding comments, perhaps), not a single line of code remains the same in NetBSD 10 (and indeed several versions prior) to the equivalent in V7 - and again, I’ve no idea how much of V1 remains in V7, nor (other than knowing it was written in assembly) how closely early PDP-11 versions resembled PDP-7 versions. By then, I suspect we really are getting into the Ship of Theseus problem - as the ancient Greeks would have been familiar with the issue, by the time every single plank of Theseus’ Ship has been replaced because the old ones have decayed, is it really the Ship of Theseus anymore?
Plus of course, though it’s more a legal issue than a philosophical one, not only at least one version of Mach-based macOS, but also one distribution of Linux - which is known not to contain either Minix or UNIX code - have been certified as UNIX by The Open Group.
My 2c
Jeff
Sent from my iPhone
> On 5 Jun 2024, at 18:51, Will Senn <will.senn@gmail.com> wrote:
>
> On 6/5/24 12:34 PM, segaloco via TUHS wrote:
>>> On Wednesday, June 5th, 2024 at 3:17 AM, Andrew Lynch via TUHS <tuhs@tuhs.org> wrote:
>>>
>>> Hi
>>>
>>> Out of curiosity, what would be considered the most direct descendent of Unix available today?
>>>
>>> ...
>>>
>>> Thanks, Andrew Lynch
>> snip
>> Given this, my humble opinion (which again this sort of thing I believe is largely a philosophical matter of opinion...) is that the BSD line captures the spirit of Research UNIX much more than System V does, while System V retains much more of the source code lineage of what most folks would consider a "pure" UNIX. Of course all of this too is predicated on treating V7 (really 32V...) as that central point of divergence.
> When I saw this thread appear, I was of two minds about it, but this lines up with where my thoughts were headed. I've done a lot of delving into the v6/v7 environments over the last 10 years or so and it feels much closer in kinship to BSD derivatives than to SysV... source code lineages aside. Also, I get more mileage out of my BSD books and docs than those treating SysV. I'd vote for *BSD as sticking closest to the unix way, if there is still such a thing... I say this as I just typed 'kldload linux64' into freebsd's terminal so I could run sublime alongside nvi... sometimes I wish I was a purist, but I'm way too fond of experimentation :).
>
> Will