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Unix-like - Wikipedia
Linux - Wikipedia
Unix - Wikipedia
Linux - Wikiwand
Guide to Unix/Why Unix-like - Wikibooks
Linux - Simple English Wikipedia, the free encyclopedia
Unix-like definition by The Linux Information Project (LINFO)
What Is Unix, and Why Does It Matter? - How-To Geek
UNIX - Simple English Wikipedia, the free encyclopedia
Linux vs. Unix: What's the difference? | Opensource.com