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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 - Open Group
UNIX | Definition, Meaning, History, & Facts | Britannica
The UNIX System -- History and Timeline -- UNIX History - Open …
Unix vs Linux: The history of how Unix started and influenced …
History of Unix - Wikipedia
What's the Difference Between Linux and Unix? - How-To Geek
What is Unix? - TechTarget