From：http://www.alidba.net/index.php/archives/139
在我们的日常工作当中，监控网络要么使用iptarf,ifstat这些命令实现的，但是需要装额外的RPM包。特别是iptarf装起来麻烦。
我看了下，linux下的/proc/net/dev记录了每块网卡发送和接受的包和字节数。因此萌生想法，写了一个。运行效果：
[root@74-82-173-217 ~]# ./net.sh
Current Ip: inet addr:74.82.173.217 Bcast:74.82.173.223 Mask:255.255.255.224
Summry info: RX bytes:203692709 (194.2 MiB) TX bytes:93525930 (89.1 MiB)
eth0 Receive Bytes: 573 Packets: 3
eth0 Send Bytes: 3086 Packets: 3
eth0 Receive Bytes: 378 Packets: 7
eth0 Send Bytes: 11236 Packets: 7
eth0 Receive Bytes: 324 Packets: 6
eth0 Send Bytes: 444 Packets: 2
eth0 Receive Bytes: 54 Packets: 1
eth0 Send Bytes: 0 Packets: 0
具体脚本的内容如下，几乎不需要修改，就可以拿到任何机器上去使用了。
[root@74-82-173-217 ~]# cat net.sh
! /bin/bash
Author: Vogts WangTao 2008-12-18
Get summry info
echo “Current Ip: “/sbin/ifconfig eth0 | grep inet
echo “Summry info: “/sbin/ifconfig eth0 | grep bytes
sleep 1 second ,monitor eth0
while true
do
receive1=cat /proc/net/dev|grep eth0 | awk '{print$1}'|sed -s 's/eth0://g'
receive_pack1=cat /proc/net/dev|grep eth0 | awk '{print$2}'
send1=cat /proc/net/dev|grep eth0 | awk '{print$9}'
send_pack1=cat /proc/net/dev|grep eth0 | awk '{print$10}'
sleep 1
receive2=cat /proc/net/dev|grep eth0 | awk '{print$1}'|sed -s 's/eth0://g'
receive_pack2=cat /proc/net/dev|grep eth0 | awk '{print$2}'
receive_cnt=expr $receive2 - $receive1
receive_pack_cnt=expr $receive_pack2 - $receive_pack1
send2=cat /proc/net/dev|grep eth0 | awk '{print$9}'
send_pack2=cat /proc/net/dev|grep eth0 | awk '{print$10}'
send_cnt=expr $send2 - $send1
send_pack_cnt=expr $send_pack2 - $send_pack1
echo ‘eth0 Receive Bytes:’ $receive_cnt ‘ Packets:’ $receive_pack_cnt
echo ‘eth0 Send Bytes:’ $send_cnt ‘ Packets:’ $send_pack_cnt
done
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