伺服器網速即時監控（shell指令碼）

用法：

#>moniotr.sh eth0 1

#!/bin/bash

# test network width
#第一個參數是網卡名稱 後面是即時重新整理的時間， 1代表1秒

function usage
{
        echo "Usage: $0 "
        echo "e.g. $0 eth0 2"
        exit 65
}
if [ $# -lt 2 ];then
        usage
fi
typeset in in_old dif_in
typeset out out_old dif_out
typeset timer
typeset eth

eth=$1
timer=$2

in_old=$(cat /proc/net/dev | grep $eth | sed -e "s/\(.*\)\:\(.*\)/\2/g" | awk '{ print $1 }' )
out_old=$(cat /proc/net/dev | grep $eth | sed -e "s/\(.*\)\:\(.*\)/\2/g" | awk '{ print $9 }' )
while true
do
sleep ${timer}
in=$(cat /proc/net/dev | grep $eth | sed -e "s/\(.*\)\:\(.*\)/\2/g" | awk '{ print $1 }' )
out=$(cat /proc/net/dev | grep $eth | sed -e "s/\(.*\)\:\(.*\)/\2/g" | awk '{ print $9 }' )
dif_in=$(((in-in_old)/timer))
dif_out=$(((out-out_old)/timer))
echo "IN: ${dif_in} Byte/s OUT:  $((${dif_out}/1024)) KB/s  :  ${dif_out}  Byte/s"
in_old=${in}
out_old=${out}
done
exit 0