old_contents: from fabric.api import *
  from playback import common
  
  class Cmd(common.Common):
      """Run command line on the target host"""
  
      def _cmd(self, command_line):
          sudo(command_line, warn_only=True)
  
      def cmd(self, *args, **kwargs):
          return execute(self._cmd, *args, **kwargs)
  
new_contents: from fabric.api import *
  from playback import common
  
  class Cmd(common.Common):
      """
      Run command line on the target host
      
      :param user(str): the user for remote server to login 
      :param hosts(list): this is a second param
      :param key_filename(str): the ssh private key to used, default None
      :param password(str): the password for remote server
      :param parallel(bool): paralleler execute on remote server, default True
      :returns: None
      """
  
      def _cmd(self, command_line):
          sudo(command_line, warn_only=True)
  
      def cmd(self, *args, **kwargs):
          """
          The command line to be executed on the remote node
  
          :param command_line(str): command line
          :returns: None
          """
          return execute(self._cmd, *args, **kwargs)
  
subject: Update docs