Nope. Linux is Unix. Linux is NOT Unix. Both statements are true....
Why?
Because in the first case, "Unix" is used in the slang form, ie. "an os which is unix-like". In the second case, it is used in the proper form "That which is wholly owned by SCO".
I started on IRIX, which is not SunOS (what the hell is with their versioning anyhoo?) nor Linux, but is more SystemV with some BSD flavor...
Or is it BSD-like with naught but a whisper of SystemV?
<shrug>
Either way, it works for me and isn't filled with billions of little clock-cycle eaters like some others we could mention...
(with all apologies to the Simpsons)
"Did anyone here create a bloated unix-like OS? You might have been high when you did it.... Red Hat, I'm looking at you...."