#!/usr/bin/env python
# -*- coding: utf-8 -*-

import os
import sys
import glob

os.putenv("SAC_DISPLAY_COPYRIGHT", '0')

if len(sys.argv) != 2:
    sys.exit("Usage: python {} dirname\n".format(sys.argv[0]))

dirname = sys.argv[1]

os.chdir(dirname)
for fname in glob.glob("*.SAC"):
    net, sta, loc, chn = fname.split('.')[6:10]
    os.rename(fname, "{}.{}.{}.{}.SAC".format(net, sta, loc, chn))

os.chdir("..")