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.