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This section describes features unique to Bash.
6.1 Invoking Bash Command line options that you can give to Bash. 6.2 Bash Startup Files When and how Bash executes scripts. 6.3 Interactive Shells What an interactive shell is. 6.4 Bash Conditional Expressions Primitives used in composing expressions for the
6.5 Shell Arithmetic Arithmetic on shell variables. 6.6 Aliases Substituting one command for another. 6.7 Arrays Array Variables. 6.8 The Directory Stack History of visited directories. 6.9 Controlling the Prompt Controlling the PS1 string. 6.10 The Restricted Shell A more controlled mode of shell execution. 6.11 Bash POSIX Mode Making Bash behave more closely to what the POSIX standard specifies.