Python版监控Linux流量，直接上代码，使用OptionParser来传入参数
#coding:utf-8
#-------------
#Author:Hu
#Data:20150520
#-------------
from __future__ import division
import re
import time
from optparse import OptionParser
def getbandwidth(eth='eth0',intevel=1):
a=open('/proc/net/dev')
data=a.read()
patten=eth + '.*'
if not re.search(patten,data):
print "The ETHname not have"
exit(1)
Rev_old=re.search(patten,data).group().replace(':',' ').split()[1]
Send_old=re.search(patten,data).group().replace(':',' ').split()[9]
a.close()
while True:
#print intevel
time.sleep(int(intevel))
a=open('/proc/net/dev')
data=a.read()
Rev=re.search(patten,data).group().replace(':',' ').split()[1]
Send=re.search(patten,data).group().replace(':',' ').split()[9]
diff_Rev=int(Rev)-int(Rev_old)
diff_Sen=int(Send)-int(Send_old)
diff_M=diff_Rev*8/1024/1024/int(intevel)
diff_S=diff_Sen*8/1024/1024/int(intevel)
print time.strftime("%Y%m%d %H:%M:%S") + ' The Recevie is %6.2f Mbps(byte is %d)' % (diff_M,diff_Rev) + ' The Send is %6.2f Mbps(byte is %d)' % (diff_S,diff_Sen)
Rev_old=Rev
Send_old=Send
a.close()
if __name__=='__main__':
import sys
usage='''%prog [-i ethname] [-t interveltime]
Example:%prog -i eth0 -t 1'''
parser=OptionParser(usage=usage,version='2.0_20150602')
parser.add_option('-i','--interface',dest='interface',default='eth0',help='Wann to interface')
parser.add_option('-t','--time',dest='intevel',type='int',default='1',help='The intevel time')
(options,args)=parser.parse_args()
print "The interafce is %s and the intevel time is %d" % (options.interface,options.intevel)
getbandwidth(options.interface,options.intevel)
使用方法：
'''%prog [-i ethname] [-t interveltime]
Example:%prog -i eth0 -t 1'''
默认是eth0 ，时间间隔是1
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