In my opinion there should be a distinction between Unix and Unix-based operating systems or Unix clones, it is true that Unix was quite influential but as an AT&T operating system, Bell Labs, Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy , and Joe Ossanna no longer exists. Even so to say that Unix is still alive for me is a mistake, I personally prefer the term "Unix-based operating systems (or clones such as GNU / Linux) are the most used in such a market (whatever that market)" to refer to Unix as operating system.