QUIET QUIET Control the Verbosity of the Interpreter

Usage

The quiet function controls how verbose the interpreter
is when executing code.  The syntax for the function is

   quiet flag

where flag is one of
  -  'normal' - normal output from the interpreter

  -  'quiet' - only intentional output (e.g. printf calls and
disp calls) is printed.  The output of expressions that are not
terminated in semicolons are not printed.

  -  'silent' - nothing is printed to the output.

The quiet command also returns the current quiet flag.