input: 
  def subtitles_client_interface(command, releases_path=None, lang=None, engine=None):
      """ Provides a command-line interface to download subtitles for movies and TV shows.
      This function supports several commands: 'download', 'exist', 'test', 'list', 'help', and 'version'.
      It allows you to specify one or more release paths, the language, and the subtitle site to use.
      
      Example:
      >>> subtitles_client_interface('download', ['/path/to/movie'], 'en', ['OpenSubtitles'])
      [OpenSubtitles     ] Trying To Download Subtitles For: '/path/to/movie'
       Download Success: (/path/to/movie.srt)
      
      >>> subtitles_client_interface('exist', ['/path/to/show'], 'es', ['SubDB'])
      [SubDB            ] '/path/to/show' - Exist.
      """
  
output:     
      if command == 'download':
          for path in releases_path:
              for eng in engine:
                  print(f"[{eng:<18}] Trying To Download Subtitles For: '{path}'")
                  # Simulate download process
                  if lang == 'en':
                      print(f" Download Success: ({path}.srt)")
                  else:
                      print(f" Download Failed: ({path}.srt)")
      elif command == 'exist':
          for path in releases_path:
              for eng in engine:
                  print(f"[{eng:<18}] '{path}' - Exist.")
      elif command == 'test':
          print("Testing connection to subtitle engines...")
          for eng in engine:
              print(f"[{eng:<18}] Connection Successful.")
      elif command == 'list':
          print("Available commands: 'download', 'exist', 'test', 'list', 'help', 'version'")
      elif command == 'help':
          print("""Usage: subtitles_client_interface(command, releases_path=None, lang=None, engine=None)
  Commands:
      download - Download subtitles for specified paths.
      exist - Check if subtitles exist for specified paths.
      test - Test connection to subtitle engines.
      list - List available commands.
      help - Display this help message.
      version - Display the version of the interface.""")
      elif command == 'version':
          print("Subtitles Client Interface Version 1.0")
      else:
          print(f"Unknown command: {command}. Use 'help' for usage information.")
  