shell脚本df-h内存占用率过高杀进程

#!/bin/sh
while true ; do
	DEV=`df -hP | grep '/dev/root' | cut -d' ' -f1 | sort`
	for I in $DEV
	do dev=`df -Ph | grep $I | awk '{print $1}'`
	size=`df -Ph | grep $I | awk '{print $2}'`
	used=`df -Ph | grep $I | awk '{print $3}'`
	free=`df -Ph | grep $I | awk '{print $4}'`
	rate=`df -Ph | grep $I | awk '{print $5}'`
	mount=`df -Ph | grep $I | awk '{print $6}'`
	echo -e "$I:tsize:$sizetused:$usedtfree:$freetrate:$ratetmount:$mount"
	F=`echo $rate | awk -F% '{print $1}'`
	if [ $F -ge 90 ];then
		echo '$mount Warn'
		kill -9 $(pidof com.android.car)
		kill -9 $(pidof evs_app)
		kill -9 $(pidof com.chinatsp.music)
		kill -9 $(pidof com.chinatsp.music:wecarbase)
		kill -9 $(pidof com.tencent.wecarnavi)
		echo 3 >/proc/sys/vm/drop_caches
		sleep 1m
	else 
		echo 'It is OK'
	fi
	sleep 1
    done
done