code: def _stop_tunnel(cmd):
      pexpect.run(cmd)
  
imports: from __future__ import print_function
  import atexit
  import os
  import re
  import signal
  import socket
  import sys
  import warnings
  from getpass import getpass, getuser
  from multiprocessing import Process
  from ..utils.strtypes import b
label_desc: Use image node_id 8 for calling a global function with example usage: _stop_tunnel(cmd) without return types