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Linus Torvalds and friends: how Linux evolved from solo act
(www.theregister.com)
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I guess it would have ran on Unix but I imagine it would just have been remaining a server operating system and probably with some expensive licence fees as well.
There's an argument that BSD would have been dominant in that case. It was bogged down in lawsuits claiming that it was pirated Bell Unix at the time, but they were dismissed not long after.
The arrival of Linux also slowed development of the GNU Hurd kernel, so that's another possible contender.