Quick-and-dirty program to show network traffic rate on a mac, updating once a second.

etherspeed

#!/usr/bin/env python2.7
from __future__ import print_function

import subprocess
import time

def netstat():
  ifs0 = subprocess.check_output(['/usr/sbin/netstat', '-b', '-i'])
  retval = dict()
  for i in ifs0.splitlines():
    fields = i.split()
    if fields[0].startswith('en') or fields[0].startswith('utun'):
      if fields[0] not in retval:
        retval[fields[0]] = map(int, (fields[-7], fields[-5], fields[-4], fields[-2]))
  return retval

time0 = time.time()
ns0 = netstat()
print(ns0)

while True:
  time.sleep(.99)
  time1 = time.time()
  delta_t = time1 - time0
  ns1 = netstat()
  for ifname in sorted(ns1.keys()):
    if ifname not in ns0.keys():
      continue
    f0 = ns0[ifname]
    f1 = ns1[ifname]
    if f0 == f1:
      continue
    print('%-6s %.3g kipps %.3g Mibps %.3g kopps %.3g Mobps' % (ifname,
        (f1[0] - f0[0]) / (1024.0 * delta_t),
        (f1[1] - f0[1]) / (131072 * delta_t),
        (f1[2] - f0[2]) / (1024.0 * delta_t),
        (f1[3] - f0[3]) / (131072 * delta_t)))
  print()