What Is Unix? The 1969 Idea Behind macOS, Linux, and Everything You Use
Here's the twist most people get wrong: macOS is a certified UNIX to this day — and Linux technically isn't.
In 1969 at Bell Labs, Ken Thompson, Dennis Ritchie, and their colleagues built Unix around one idea: small programs that each do one thing well, then connect like building blocks. Rewritten in C, it became portable and spread through universities, spawning offshoots like BSD. Apple's macOS inherits that lineage through NeXT and BSD. Linux took a different path — in 1991 Linus Torvalds wrote a brand-new kernel from scratch, faithful to Unix's design but not its code. Pair it with the GNU tools and you get the system running most of the internet.
Unix isn't a product. It's a philosophy — and it's echoing through nearly every device you touch.
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