BTW, A similarly "for beginners" tutorial that I enjoyed, in book form, is M.G. Venkateshmurthy's "Introduction to Unix and Shell Programming," if anyone is still looking for additional material. (It gives fun "why" context to all of its "how" -- for example, it points out that the commands/flags of command-line interfaces are short and hard to remember because back when the only way to interact with your computer was a command line interface and only specialists used computers, the last thing programmers wanted to do was type a lot, so they just made up a bunch of cryptic short commands.)
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