This Linux Shell Scripting Tutorial is designed for people who wish to learn the fundamentals of shell scripting/programming. It also contains an introduction to power tools such as awk and sed. It is not the manual for the shell. While reading this tutorial you may find the manual quite useful (type man bash at $ prompt to see the manual pages). The manual contains all of the necessary information you need, but will not contain any examples which would make the ideas clear. Therefore, this tutorial contains examples rather than all of the features of the shell.
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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