docs: def do_exec(self, filename):
          """
          ::
          
              Usage:
                 exec FILENAME
  
              executes the commands in the file. See also the script command.
  
              Arguments:
                FILENAME   The name of the file
          """
          if not filename:
              Console.error("the command requires a filename as parameter")
              return
  
          if os.path.exists(filename):
              with open(filename, "r") as f:
                  for line in f:
                      Console.ok("> {:}".format(str(line)))
                      self.onecmd(line)
          else:
              Console.error('file "{:}" does not exist.'.format(filename))
              sys.exit()