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