The Shell and UNIX

It is dangerous to expose our most important possessions directly to every little effect coming from the world. Somebody may take advantage and just do damage to them. It is wise to put something in front of them. In the case of an operating system, the most important part is the kernel. Furthermore, we can take advantage of putting something in front of it, simplify working with the kernel, and make a couple of checks to ensure that nothing abusive happens. What we add before the kernel is the Shell.


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