docs: def _prepare_script(self, dest_dir, program):
          """Copy the script into the destination directory.
  
          :param dest_dir: The target directory where the script will be
              saved.
          :param program: The script text to be saved.
          :return: The name of the script file.
          :rtype: str
          """
          script_name = ExecutorFiles.PROCESS_SCRIPT
          dest_file = os.path.join(dest_dir, script_name)
          with open(dest_file, 'wt') as dest_file_obj:
              dest_file_obj.write(program)
          os.chmod(dest_file, 0o700)
          return script_name