docs: def execute(self, *, args: Union[list, tuple], options: dict) -> tuple:
          '''Execute command.'''
          cmd = self._build_cmd(args)
          process = subprocess.Popen(cmd, stdout=PIPE, stderr=PIPE, stdin=PIPE,
                                     encoding='utf-8', shell=options.get('shell', False), env=options.get('env'))
          return process