These tutorials will cover some of the basic commands which are common to most of the Unix shells available and some applications. Thus, when you are finished with these tutorials, you will be able to interact with any Unix system as seamlessly as if you had a windowing system available to you.
Traditionally, Unix/Linux/POSIX filenames can be almost any sequence of bytes, and their meaning is unassigned. The only real rules are that "/" is always the directory separator, and that filenames can't contain byte 0 (because this is the terminator). Although this is flexible, this creates many unnecessary problems. In particular, this lack of limitations makes it unnecessarily difficult to write correct programs (enabling many security flaws), makes it impossible to consistently and accurately display filenames, causes portability problems, and confuses users. more ....
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