此脚本可列出一定时间的流量及平均流量。时间可自己设置。

#!/usr/bin/env pythonimport time,sysdef all_flow(INTERFACE):    f = open('/proc/net/dev')    flow_info=f.readlines()    in_flow=[]    out_flow=[]    for eth_dev in flow_info:        if INTERFACE in eth_dev:            in_flow.append(int(eth_dev.split(':')[1].split()[0]))            out_flow.append(int(eth_dev.split(':')[1].split()[9]))    f.close()    return in_flow,out_flowdef format_flow(flow):    flow_n = float(flow)    if flow_n > 1000000:        return '%.3f MB' % (flow_n/1024/1024)     else:        return '%.3f KB' % (flow_n/1024)                                                  if __name__=='__main__':    if len(sys.argv) > 1:        INTERFACE = sys.argv[1]    else:        INTERFACE = 'eth'    in_flows = {}    out_flows = {}    all_flows0 = all_flow(INTERFACE)    count = 0       while count < 5:        time.sleep(1)                  all_flows1=all_flow(INTERFACE)        for x in range(len(all_flows0[0])):            if len(sys.argv) >1:                curr_eth = INTERFACE            else:                curr_eth = 'eth%s' % x            if len(in_flows) == x:                in_flows[curr_eth]= []                out_flows[curr_eth]=[]            print curr_eth+" in:"+ format_flow(all_flows1[0][x]-all_flows0[0][x])+"  out:"+\            format_flow(all_flows1[1][x]-all_flows0[1][x])            in_flows[curr_eth].append(all_flows1[0][x]-all_flows0[0][x])            out_flows[curr_eth].append(all_flows1[1][x]-all_flows0[1][x])        all_flows0 = all_flows1               count=count+1                                                          for key in in_flows:        sum_a=0        in_flow=''        for i in in_flows[key]:            sum_a = sum_a+i            in_flow = in_flow + format_flow(i) + ' '        #print key + ' flow_in is: %s'% in_flow        print key +" average of flow_in is: %s" % format_flow(sum_a/count)                                                      for key in out_flows:        sum_a=0        out_flow=''        for i in out_flows[key]:            sum_a = sum_a+i            out_flow = out_flow + format_flow(i) + ' '        #print key + ' flow_out is: %s'% out_flow        print key +" average of flow_out is: %s" % format_flow(sum_a/count)

默认为列出除lo以外的所有网卡的流量。也可在运行时加入网卡名作为参数如:eth0 或eth1等等。比较懒，没有做参数判断。也就是参数里输入任何字符串都不会报错，当然脚本运行获取的结果也就不会正确。