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Because the distinction remains a little vague to me, this may not be a very clear answer. I'll just try to expose my point of view, more than actual, technical facts. First of all, it is probably relevant to note that Linux is a UNIX-like system. This means that while most concepts and implementations have been inspired, sometimes taken, from UNIX, there ...


I would say your source is false. There are many different operating systems called "UNIX", but in none of them are shells such "privileged" processes that they form the underlying layer for other userspace utilities. A shell is just another userspace process.

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