Linux -- Without Unix
Because the kernel was written from scratch, Linux is technically not Unix but a new operating system .
Nonetheless, short of replicating the code from BSD, Linux owes much of its conceptual and architectural design principles to the example of the BSD. At the same time, Linux has been careful to avoid mistakes the BSD has made. And finally, in its commitment to portability and simplicity, Linux has carried the torch, lit by the fathers of the original Unix, farther than any other systems. The legacy of BSD and other Unix-bases operating systems proved valuable resources and inspiration for the development of Linux. To strip the kernel is just plain foolishness!
Solidus Fullstop, Esq.