Linux command encyclopedia download There are two basic ideas in Linux: first, everything is a file; second, every software has a definite purpose. The first one is that everything in the system is boiled down to a file, including commands, hardware and software devices, operating systems, processes, etc. For the operating system kernel, they are all regarded as files with their own characteristics or types. . As for Linux being based on Unix, it is largely because the basic ideas of the two are very similar.
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