Is Haiku a Unix-like OS?


I would strike “but did not originate from a Unix-derived operating system”. That may be a technically nice point, since it’s well defined, but its usefulness is limited by the extreme rarity of OSs that meet it. NetBSD, FreeBSD … is OpenBSD still around? MacOS is questionable, if the Berkeley part of it is only an appendage, to a Mach “microkernel.” There are plenty of others, but not in wide popular use. I’m sure Solaris and AIX are still around, but in this context, who cares?

“Mostly” POSIX.1 compliant raises as many questions as it answers. Isn’t it like being somewhat pregnant?


Academia and computer historian/journalists/scholars/scribes.

The question is Haiku considered Unix-like and using a Unix-style system design internal?

Well, the original NewOS kernel project used the core UNIX OS design books. So, YES, again.


Yes or no, hard to tell as the question changes. In a software context, I take “UNIX-derived” to mean, a source code lineage from AT&T UNIX. Even if not one line of code survives from that lineage, that’s still very different from “read the book”.