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Unix-like - Wikipedia
Linux - Wikiwand
Linux - Wikipedia
What is UNIX and what's UNIX-like? - Super User
Linux - Simple English Wikipedia, the free encyclopedia
Unix - Wikipedia
Unix-like definition by The Linux Information Project (LINFO)
Guide to Unix/Why Unix-like - Wikibooks
UNIX - Simple English Wikipedia, the free encyclopedia
What Is Unix, and Why Does It Matter? - How-To Geek