之前写过一个查看Linux服务器当前流量的小脚本，很简单，但能直观的给我们一些信息
#!/bin/sh
###统计10s内的平均流量，以Mb为单位
if [ "$1" = "" ];then
echo -e "\n use interface_name after the script,like \"$0 eth0\"...\n"
exit -1
fi
echo -e "\n start monitoring the $1,press \"ctrl+c\" to stop"
echo ----------------------------------------------------------
#ls /etc/sysconfig/network-scripts/|grep ifcfg|cut -d "-" -f 2
while true
do
RX_bytes=`cat /proc/net/dev|grep "$1"|awk '{print $1}'|cut -d ":" -f 2`
TX_bytes=`cat /proc/net/dev|grep "$1"|awk '{print $9}'`
sleep 10
RX_bytes_later=`cat /proc/net/dev|grep "$1"|awk '{print $1}'|cut -d ":" -f 2`
TX_bytes_later=`cat /proc/net/dev|grep "$1"|awk '{print $9}'`
###Mb=B*8/1024/1024
speed_RX=`echo "scale=2;($RX_bytes_later - $RX_bytes)*8/1024/1024/10"|bc`
speed_TX=`echo "scale=2;($TX_bytes_later - $TX_bytes)*8/1024/1024/10"|bc`
printf "%-3s %-3.1f %-10s %-4s %-3.1f %-4s\n" IN: $speed_RX Mb/s OUT: $speed_TX Mb/s
done
使用效果如下图