linux抓取load average数据

#!/bin/bash

echo '' > ~/getLoad/1minute.txt
echo '' > ~/getLoad/5minute.txt
echo '' > ~/getLoad/15minute.txt


SECONDS=0

# echo ${oneminute:0:4}

while [ $SECONDS -le 1200 ]
do

#get load average data
oneminute=`uptime |awk '{print $8}'`
fiveminute=`uptime |awk '{print $9}'`
fifteenminute=`uptime |awk '{print $10}'`

echo ${oneminute:0:4} >> ~/getLoad/1minute.txt
echo ${fiveminute:0:4} >> ~/getLoad/5minute.txt
echo ${fifteenminute} >> ~/getLoad/15minute.txt
sleep 2
done