Intro

Each time we type a command and press the Enter key, bash does some kind of processing upon the text before executing our command. For example if there is a "*" in the command, it is replaced by the names of the matching files. This replacement is called an expansion.
Quoting is used to control how the shell splits the input into parts. It also disables some types of expansion. Both single and double quotes can be used, and there are some differences between them.
The shell environment (printenv, set, export). Customizing the prompt.

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