Centos（带宽测试脚本-测试通过）

#!/bin/bash
 
# test network width
 
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: ${dif_out} Byte/s"
in_old=${in}
out_old=${out}
done
exit 0

#./此文件 网卡端口名 刷新时间(秒)
#./netwidth eth0 2
详细出处参考：http://www.itqun.net/content-detail/131003.html