None of Apple’s operating systems are based on Linux. iOS, MacOS, TVOS, and WatchOS are all based on XNU/Darwin, which is in the BSD lineage (predates Linux), but also incorporates the Mach Microkernel (though the OS is not a microkernel style system)
> None of Apple’s operating systems are based on Linux
Not now, but before Apple was sold to NeXT for a Steve Jobs minus $400 million, there was MkLinux. It was an interesting way to run Linux on beige PowerMacs and many places I've worked with gladly adopted it giving new life to abandoned Macs as X terminals and lightweight workstations.
Oddly enough, it has a newer Mach kernel than NeXT's OS.
It says iOS not macOS and now I’m getting downvoted for reading. Brilliant. MacOS is fully certified allowing for all that sweet government contract money.
