But it hides most of the real Unix directory tree, its /etc is relatively empty, it doesn’t have an X server – it’s an optional extra.
So taking that list of general characteristics, and adding a less visible one – that it’s programmed mainly in C or something C-like – and requiring that the OS looks like Unix and nothing else, meaning there’s no other native layer underneath, then the family is bigger.
The original microkernel, CMU Mach, led to a whole bunch of Unix OSes, including the Open Group’s OSF/1 and DEC Tru64, as well as MkLinux and famously the GNU HURD.
The only one that isn’t a historical curiosity or a tiny neglected niche is Apple’s macOS family, including iOS, iPadOS and so on.
QNX is a commercial microkernel Unix-like OS, and it’s used in billions of embedded devices … although the only time you might have played with it was Blackberry 10.
A host machine, plus dumb text terminals on serial connections, with no graphics and no networking – even so, high-end kit for the 1970s.
The original article contains 1,892 words, the summary contains 179 words. Saved 91%. I’m a bot and I’m open source!
This is the best summary I could come up with:
But it hides most of the real Unix directory tree, its /etc is relatively empty, it doesn’t have an X server – it’s an optional extra.
So taking that list of general characteristics, and adding a less visible one – that it’s programmed mainly in C or something C-like – and requiring that the OS looks like Unix and nothing else, meaning there’s no other native layer underneath, then the family is bigger.
The original microkernel, CMU Mach, led to a whole bunch of Unix OSes, including the Open Group’s OSF/1 and DEC Tru64, as well as MkLinux and famously the GNU HURD.
The only one that isn’t a historical curiosity or a tiny neglected niche is Apple’s macOS family, including iOS, iPadOS and so on.
QNX is a commercial microkernel Unix-like OS, and it’s used in billions of embedded devices … although the only time you might have played with it was Blackberry 10.
A host machine, plus dumb text terminals on serial connections, with no graphics and no networking – even so, high-end kit for the 1970s.
The original article contains 1,892 words, the summary contains 179 words. Saved 91%. I’m a bot and I’m open source!