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Unix - Wikipedia
What is UNIX
Introduction to UNIX System - GeeksforGeeks
What Is Unix, and Why Does It Matter? - How-To Geek
UNIX | Definition, Meaning, History, & Facts | Britannica
Linux/Unix Tutorial - Online Tutorials Library
What is Unix? - TechTarget
History of Unix - Wikipedia
Unix vs Linux: The history of how Unix started and influenced …
The UNIX System -- The Single UNIX Specification