LinuxInsider: Comparing Linux to System VR4

“Two weeks ago, I asked for reader aid in getting documentation
on early 1990s System VR4 Unix to help understand what things can
be done with Linux today but could not be done with AT&T System

“The question was naive and I need more help (and aspirin) in
struggling toward a better answer than I’ve reached so far. In
fact, because my interest was originally sparked by Linus Torvald’s
comment that he has nothing to learn from Solaris, the comparison
should have been to the SunOS 5.0 kernel from 1992. That kernel, of
course, was the first to extensively address the two things that
most differentiate the Linux kernel today from SVR4 then: threading
and user space operations…”

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