code: def shell_logger(output):
      
      if not os.environ.get('SHELL'):
          logs.warn("Shell logger doesn't support your platform.")
          sys.exit(1)
  
      fd = os.open(output, os.O_CREAT | os.O_TRUNC | os.O_RDWR)
      os.write(fd, b'\x00' * const.LOG_SIZE_IN_BYTES)
      buffer = mmap.mmap(fd, const.LOG_SIZE_IN_BYTES, mmap.MAP_SHARED, mmap.PROT_WRITE)
      return_code = _spawn(os.environ['SHELL'], partial(_read, buffer))
  
      sys.exit(return_code)
docs: Logs shell output to the `output`.
  
      Works like unix script command with `-f` flag.