very nice

Thanks for that great script.
The output is something like
RX Bytes: 661GB, TX Bytes: 150GB; RX Speed: 62KBps, TX Speed: 25KBps; OK bandwidth utilization | rx=63021;1152921504606846976;3458764513820540928 tx=25090;1152921504606846976;3458764513820540928

And I could graph it too!