code: def run(self, halt_on_nonzero=True, quiet=False, q=False, streaming=False):
          
          commands = str(self)
          if not (quiet or q):
              self._echo.cmd(commands)
  
          env = self._context[0].get('env', {}) if len(self._context) > 0 else os.environ
          executable = self.current_context.get('executable')
          try:
              process = subprocess.Popen(commands,
                                         bufsize=1,
                                         shell=True,
                                         env=env,
                                         stdin=subprocess.PIPE,
                                         stdout=subprocess.PIPE,
                                         stderr=subprocess.PIPE,
                                         executable=executable,
                                         universal_newlines=True)
              result = Result(process, commands, self._context, streaming, halt_on_nonzero=halt_on_nonzero)
  
          except Exception as e:
              result = Result(None, commands, self._context, exception=e)
              result.dump_exception()
              if halt_on_nonzero:
                  raise e
                  
          finally:
              self.clear()
          
          return result
docs: After building your commands, call `run()` to have your code executed.