通过这个脚本net.sh我们可以看到某个网卡的收发报文流量概况，在某些情况下
可以用来进程网络程序的参数调优。
1 #!/bin/bash 2 if [ -n "$1" ]; then 3 eth_name=$1 4 else 5 eth_name="eth0" 6 fi 7 i=0 8 send_o=`/sbin/ifconfig $eth_name | grep bytes | awk '{print $6}' | awk -F : '{print $2}'` 9 recv_o=`/sbin/ifconfig $eth_name | grep bytes | awk '{print $2}' | awk -F : '{print $2}'` 10 send_n=$send_o 11 recv_n=$recv_o 12 while [ $i -le 100000 ]; do 13 send_l=$send_n 14 recv_l=$recv_n 15 sleep 1 16 send_n=`/sbin/ifconfig $eth_name | grep bytes | awk '{print $6}' | awk -F : '{print $2}'` 17 recv_n=`/sbin/ifconfig $eth_name | grep bytes | awk '{print $2}' | awk -F : '{print $2}'` 18 i=`expr $i + 1` 19 send_r=`expr $send_n - $send_l` 20 recv_r=`expr $recv_n - $recv_l` 21 total_r=`expr $send_r + $recv_r` 22 send_ra=`expr ( $send_n - $send_o ) / $i` 23 recv_ra=`expr ( $recv_n - $recv_o ) / $i` 24 total_ra=`expr $send_ra + $recv_ra` 25 sendn=`/sbin/ifconfig $eth_name | grep bytes | awk -F ( '{print $3}' | awk -F ) '{print $1}'` 26 recvn=`/sbin/ifconfig $eth_name | grep bytes | awk -F ( '{print $2}' | awk -F ) '{print $1}'` 27 clear 28 echo "Last second : Send rate: $send_r Bytes/sec Recv rate: $recv_r Bytes/sec Total rate: $total_r Bytes/sec" 29 echo "Average value: Send rate: $send_ra Bytes/sec Recv rate: $recv_ra Bytes/sec Total rate: $total_ra Bytes/sec" 30 echo "Total traffic after startup: Send traffic: $sendn Recv traffic: $recvn" 31 done
直接./net.sh运行的话默认是网卡eth0, 如果需要看其它的网卡运行./net.sh eth1
运行结果如下图所示：
