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  1. Unix - Wikipedia

  2. Introduction to UNIX System - GeeksforGeeks

  3. What Is Unix, and Why Does It Matter? - How-To Geek

  4. UNIX | Definition, Meaning, History, & Facts | Britannica

  5. What is UNIX

  6. History of Unix - Wikipedia

  7. An Introduction to the Unix Command Line - Stanford University

  8. A Brief History of Unix - How-To Geek

  9. What is Unix? - TechTarget

  10. The UNIX System -- The Single UNIX Specification