直接上脚本：

#!/bin/bash

while true

do

	echo 2^2^20 | bc & >/dev/null

done

查看CPU使用率用top命令即可

释放CPU：

ps -ef |grep bc |grep -v grep |awk '{print $2}' |xargs kill

定时运行Crontab：

*/6 * * * * /bin/bash /home/shells/cpuplus.sh

*/5 * * * * ps -ef |grep cpuplus |grep -v grep |awk '{print $2}' |xargs kill

*/5 * * * * ps -ef |grep bc |grep -v grep |awk '{print $2}' |xargs kill