- Quick Check `IF`:
  - This form of `IF` can only be used in the shell.
  - The quick check `IF` uses the syntax `IF <test>` and prints the result of the evaluation of the `IF` (true or false) to the terminal.

        nM> set debug yes
        nM> if debug isTrue
        INFO: Logical test = true

        nM> set debug true
        nM> if debug isTrue
        INFO: Logical test = true

        nM> set debug on
        nM> if debug isTrue
        INFO: Logical test = true

        nM> set debug off
        nM> if debug isTrue
        INFO: Logical test = false

        nM>