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To control thread execution.
To catch misspellings of the "test" command (they're the same).
To set a temporary variable.
None; there is no such command in standard Linux.
To identify and initialize a terminal.
Answer:
To identify and initialize a terminal.
Always ask for confirmation
Back up the file before it deletes the file
Ask for confirmation if configured to do so
Never ask for confirmation
Answer:
Ask for confirmation if configured to do so