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Yes, it is all Unix
(feddit.nl)
Alt text: meme with the 'Always has been' format Linux, MacOS, OpenBSD and ChromeOS logos on top of the Earth The first astronaut says 'Wait, it's all Unix?' A Windows logo, on top of the second astronaut. The second astronaut says 'Always has been' and points a gun to the first astronaut.
No, it's not unix. None of the systems in the meme are actually unix.
Linux is unix-like, made initially by 1 guy who just so happened to base it around another unix-like OS and has quite literally nothing to do with unix
BSD has no original AT&T unix code and while it does work in similar ways, it is still not unix
Windows is windows... The closest thing it has ever gotten to unix is the Windows Services for UNIX, which literally only existed so that M$ could claim POSIX compliance and get a lot of government money...
spoiler
I sound like a fcking loser omg