def METHOD_NAME():
    """
    standard command-line processing
    source directory (NeXus definitions dir) named as command line argument
    target directory is specified (or defaults to present working directory)
    """
    cli = command_args()
    root_dir = os.path.abspath(cli.defs_dir)
    qualify_inputs(root_dir)
    file_list = sift_file_list(find_source_files(root_dir))
    for fn in file_list:
        update(fn)