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We should point out here that the focal point of any operating system is its ‘kernel’. Without going into great detail, the kernel is what tells the big chip that controls your computer to do what you want the program that you’re using to do. To use a metaphor, if you go to your favorite Italian restaurant and order ‘Spaghetti alla Bolognese’, this dish is like your operating system. There are a lot of things that go into making that dish like pasta, tomato sauce, meatballs and cheese. Well, the kernel is like the pasta. Without pasta, that dish doesn’t exist. You might as well find some bread and make a sandwich. A plate of just pasta is fairly unappetizing.
Without a kernel, an operating system doesn’t exist. Without programs, a kernel is useless.
(Extraído de: Beginners Level Course: What is Linux? linux.org.
http://www.linux.org/threads/what-is-linux.4076/)
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