Bash Reference Manual. Node: Executing Commands
Redirections
Basic Shell Features
Shell Scripts
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.
Redirections
Basic Shell Features
Shell Scripts