add flow_count

git-svn-id: http://172.17.0.253/svn/soft_pkgs/sys_nicmonitor@1225 09c3743a-b0dd-45d3-b506-aa74c7a2a6ef

docs/flow_count.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+echo -n "请输入需要查询的网卡的接口:"
+read eth
+echo "你要查询的网卡接口为"$eth
+echo -n "输入需要等到的时间(秒):"
+read sec
+echo "你计算的是"$sec"秒内的平均流量,请等待."
+infirst=$(awk '/'$eth'/{print $1 }' /proc/net/dev |sed 's/'$eth'://')
+outfirst=$(awk '/'$eth'/{print $10 }' /proc/net/dev)
+sumfirst=$(($infirst+$outfirst))
+sleep $sec"s"
+inend=$(awk '/'$eth'/{print $1 }' /proc/net/dev |sed 's/'$eth'://')
+outend=$(awk '/'$eth'/{print $10 }' /proc/net/dev)
+sumend=$(($inend+$outend))
+sum=$(($sumend-$sumfirst))
+echo $sec"秒内总流量为:"$sum"bytes"
+aver=$(($sum/$sec))
+echo "平均流量为:"$aver"bytes/sec"