Why did GNU choose UNIX?

Or rather, why did rms et al dislike UNIX? It seems to come up a lot that they basically settled for a UNIX clone since it was widespread. They certainly didn't care for the philosophy.

>>30
In Unix terminology, the kernel is the operating system. Whether it's sh or chess, these are application programs bundled with the OS. There used to be some name for an operating system with additional user programs, but I forget what it was. UNIX resellers used to use it when they shipped UNIX plus a few of their own programs.

This is all independent of GNU and Microsoft and other groups who have chosen to use the term ``operating system'' differently. Read The Design of the UNIX Operating System by Maurice J. Bach which explains the structure of UNIX very well.