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/Bash

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.