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When the Linux kernel is used as-is as the only software layer and the application runs directly on top of it then it is an OS.
A common definition of an operating system includes providing the ability for the user to operate the system, which means making full use of available hardware. The Linux kernel isn't designed to do this, its too limited in scope. Even Linus calls it a kernel and expects it to be used in an operating system.
If you had a hardware device that made use of the Linux kernel without an OS I would just describe that as an embedded device that used the Linux kernel.
Some kernels can act as a barebone OS on their own but they are still called kernels because they do not provide those additional absract software layers that come with an operating system. If your embedded device has no need for those layers it is still interacting with the kernel, not an OS.




Member since:
2006-02-15
Linux is a kernel.
ChromeOS is an OS.
I personally see them both as OSes. When the Linux kernel is used as-is as the only software layer and the application runs directly on top of it then it is an OS. When Linux kernel is used as a foundation for a much larger standardized software, API and ABI selection then it is not an OS as of itself but rather only a part of one.
Feel free to disagree, but for the sake of any discussion it'd be nice to explain why you disagree and not just say you do.