Return type: Switch
Returns:       True or false.

Syntax

(not | !) test-expression

A logical operator that simply negates its operand. The resulting expression returns false if the operand evaluated to true, and vice versa. You may use either the exclamation mark ! or the word not for this operator.

Usage example:

  do when a < b and ! (c < d)
  ...
  done

Related Syntax    true, false

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