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.