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6 Bash Features
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This section describes features unique to Bash.

* Invoking Bash
Command line options that you can give to Bash.
* Bash Startup Files
When and how Bash executes scripts.
* Interactive Shells
What an interactive shell is.
* Bash Conditional Expressions
Primitives used in composing expressions for the 'test' builtin.
* Shell Arithmetic
Arithmetic on shell variables.
* Aliases
Substituting one command for another.
* Arrays
Array Variables.
* The Directory Stack
History of visited directories.
* Printing a Prompt
Controlling the PS1 string.
* The Restricted Shell
A more controlled mode of shell execution.
* Bash POSIX Mode
Making Bash behave more closely to what the POSIX standard specifies.

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