[Raion]

Hey John,

So the POSIX standard was first published in 1988, the first revision is IEEE Std 1003.1-1988

That would apply to something like 3.x or 4.x BSD, some of the SVR1/2/3 OSes etc.

If you want to see how things went along, look at the code of xv6, 2BSD, System V R1 (This code is proprietary, but available online) and other such things.