6 Bash Features

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.