old_contents: """
  homeassistant.components.notify.command_line
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  command_line notification service.
  
  For more details about this platform, please refer to the documentation at
  https://home-assistant.io/components/notify.command_line/
  """
  import logging
  import subprocess
  from homeassistant.helpers import validate_config
  from homeassistant.components.notify import (
      DOMAIN, BaseNotificationService)
  
  _LOGGER = logging.getLogger(__name__)
  
  
  def get_service(hass, config):
      """ Get the Command Line notification service. """
  
      if not validate_config({DOMAIN: config},
                             {DOMAIN: ['command']},
                             _LOGGER):
          return None
  
      command = config['command']
  
      return CommandLineNotificationService(command)
  
  
  # pylint: disable=too-few-public-methods
  class CommandLineNotificationService(BaseNotificationService):
      """ Implements notification service for the Command Line service. """
  
      def __init__(self, command):
          self.command = command
  
      def send_message(self, message="", **kwargs):
          """ Send a message to a command_line. """
  
          try:
              proc = subprocess.Popen(self.command, universal_newlines=True,
                                      stdin=subprocess.PIPE, shell=True)
              proc.communicate(input=message)
              if proc.returncode != 0:
                  _LOGGER.error('Command failed: %s', self.command)
          except subprocess.SubprocessError:
              _LOGGER.error('Error trying to exec Command: %s', self.command)
  
new_contents: """
  homeassistant.components.notify.command_line
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  command_line notification service.
  
  For more details about this platform, please refer to the documentation at
  https://home-assistant.io/components/notify.command_line/
  """
  import logging
  import subprocess
  from homeassistant.helpers import validate_config
  from homeassistant.components.notify import (
      DOMAIN, BaseNotificationService)
  
  _LOGGER = logging.getLogger(__name__)
  
  
  def get_service(hass, config):
      """ Get the Command Line notification service. """
  
      if not validate_config({DOMAIN: config},
                             {DOMAIN: ['command']},
                             _LOGGER):
          return None
  
      command = config['command']
  
      return CommandLineNotificationService(command)
  
  
  # pylint: disable=too-few-public-methods
  class CommandLineNotificationService(BaseNotificationService):
      """ Implements notification service for the Command Line service. """
  
      def __init__(self, command):
          self.command = command
  
      def send_message(self, message="", **kwargs):
          """ Send a message to a command_line. """
  
          try:
              proc = subprocess.Popen(self.command, universal_newlines=True,
                                      stdin=subprocess.PIPE, shell=True)
              proc.communicate(input=message)
              if proc.returncode != 0:
                  _LOGGER.error('Command failed: %s', self.command)
          except subprocess.SubprocessError:
              _LOGGER.error('Error trying to exec Command: %s', self.command)
  
subject: UPdate docstring