Unix vs Linux: What's the Real Difference?

Open a terminal on a Mac and another on a Linux server, type the same commands, and you get almost the same results. Yet the Mac is officially certified as Unix, and Linux, technically, is not. So what is the real difference? In this video we follow the whole story, from Bell Labs in 1969 to the phone in your pocket, and explain why Linux is "Unix-like", why your Mac really is Unix, and why the two still feel like twins. In this video: • What an operating system does: the kernel is the engine, the shell and tools are the rest of the car • 1969: Ken Thompson and Dennis Ritchie create Unix at Bell Labs, then rewrite it in C • The Unix way: small tools that each do one thing well, joined by pipes • BSD, commercial Unix, and the Unix wars • GNU: Richard Stallman's free rebuild ("GNU's Not Unix") • 1991: Linus Torvalds writes a kernel "just a hobby" and Linux is born • Is Linux a Unix? Unix-like vs certified UNIX (and why macOS passes) • POSIX: the shared rulebook that makes your skills carry over • Who runs the world today: supercomputers, the cloud, Android, Mars ⏱ CHAPTERS 00:00 Twins: a Mac and a Linux server 00:28 What an operating system does 00:57 1969: Unix is born at Bell Labs 01:32 The Unix way: small tools and pipes 02:00 BSD, big business and the Unix wars 02:35 GNU: the free rebuild begins 03:09 1991: Linus Torvalds and Linux 03:43 Is Linux a Unix? (Unix-like vs certified) 04:23 POSIX: one shared rulebook 04:52 Who runs the world today 05:29 The whole picture 📚 SOURCES • The Open Group, Register of UNIX Certified Products: macOS 26 Tahoe, UNIX 03 (certificate P1223, first issued 29 Aug 2025). • Huawei (Sep 2016): KunLun EulerOS 2.0 passes UNIX 03 certification. • Linus Torvalds, comp.os.minix, 25 Aug 1991: "What would you like to see most in minix?" • Richard Stallman, the GNU announcement (27 Sep 1983), gnu.org. • D. M. Ritchie and K. Thompson, "The UNIX Time-Sharing System", Communications of the ACM, 1974. • D. M. Ritchie, "The Evolution of the Unix Time-sharing System", 1979. • IEEE Std 1003.1 (POSIX); the name POSIX was suggested by Richard Stallman. • TOP500: every listed system has run a Linux-based OS since November 2017 (June 2026 list). • NASA JPL (2021): Meet the open-source software powering NASA's Ingenuity Mars Helicopter. Note: facts are as of September 2026. UNIX® is a registered trademark of The Open Group. "Most Linux distributions are not certified" — a few (Huawei's EulerOS, Inspur K-UX) have been. ▶ Watch next: • Linux File System Explained — [add link] • Every API Explained — [add link] Not affiliated with Apple, IBM, HP, The Open Group, the Linux Foundation or the GNU Project. All logos are trademarks of their respective owners and are shown only to identify the systems discussed. Tux the penguin by Larry Ewing, drawn with The GIMP. Logo files: Simple Icons (CC0). Icons: Tabler Icons (MIT). #Linux #Unix #OperatingSystems