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