Executing Commands (Bash Reference Manual)

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3.7 Executing Commands

• Simple Command Expansion		How Bash expands simple commands before executing them.
• Command Search and Execution		How Bash finds commands and runs them.
• Command Execution Environment		The environment in which Bash executes commands that are not shell builtins.
• Environment		The environment given to a command.
• Exit Status		The status returned by commands and how Bash interprets it.
• Signals		What happens when Bash or a command it runs receives a signal.