reddred wrote:

Now it's true that the v7 kernal, the BSD kernal, and the SysV kernal are
radically different from one another, but they all have supersets of the
same interface to the applications code, which makes the all Unix.

I have trouble accepting that this issue boils down to interface
compatability, when the philosophies of all of the above are indeed
radically different. And there are obviously legal differences. If an OS
meets the proprietary spec, it doesn't mean they want to be called 'Unix'.
...
I guess what I was getting at is, what are people supposed to call Unix-like
systems?
'Loose-collection-of-mostly-posix-compliant-bits-of-operating-systems-that-a
ct-like-unix-but-arent'?

I usually refer to them as *nix or unices (small 'U')