Bash scripting: my own cheatsheet

bash (Bourne Again shell) is the standard GNU shell, a powerful tool for the advanced and professional user.
This shell is a so-called superset of the Bourne shell, a set of add-ons and plug-ins.
This means that the Bourne Again shell is compatible with the Bourne shell: commands that work in sh, also work in bash.

However, the reverse is not always the case.

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