[Tor3]

No, that's not how Linux started. No fork from Unix, if that's the comparison you were making. Linux started as a completely independent project, a multi-tasking kernel printing AAA...BBB, and, as it progressed, working towards being basically Unix compatible. But it was not a fork from anything.

[glitchc]

Yes, my comment is poorly phrased, but the spirit is valid. Linux could not have come from Unix as Unix OSes were closed source at the time. It was not a fork. However, Linux was intended to be an open-source variant to Unix from inception. Torvalds aimed for POSIX and ABI compatibility from the start, it was one of his stated goals for developing the kernel.