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Unix - Wikipedia
What Is Unix, and Why Does It Matter? - How-To Geek
Introduction to UNIX System - GeeksforGeeks
What is UNIX
What's the Difference Between Linux and Unix? - How-To Geek
UNIX | Definition, Meaning, History, & Facts | Britannica
What is Unix? - TechTarget
Unix vs Linux: The history of how Unix started and influenced …
Linux vs. Unix: What's the difference? | Opensource.com
The UNIX System -- The Single UNIX Specification