判断某一个分区空间利用率及剩余空间不超过阀值

#/bin/bash
dk_checkpoint_per=90
dk_checkpoint_num=5.5
echo $dk_checkpoint_num
mount_on='data1'
if df -h |grep $mount_on 2>&1 >/dev/null;then
        dk_percent=`df -h |grep $mount_on|awk '{print $5}'|sed 's/%//g'`
        dk_unused=`df -h |grep $mount_on|awk '{print $4}'`
else
        dk_percent=`df -h|sed -n '2p'|awk '{print $5}'|sed 's/%//g'`
        dk_unused=`df -h|sed -n '2p'|awk '{print $4}'`
fi

if `echo $dk_unused|grep 'M'`;then
        echo '分区'$mount_on'使用率_'$dk_percent'%剩余'$dk_unused''
        exit
else
        dk_unused_num=`echo $dk_unused|sed 's/G//'`

fi

echo $dk_percent
echo $dk_checkpoint_per
echo ${dk_unused_num}

if [[ $dk_percent > $dk_checkpoint_per ]] || [[ ${dk_unused_num} < ${dk_checkpoint_mum} ]]; then
        echo '分区'$mount_on'使用率_'$dk_percent'%剩余'$dk_unused''
        exit
        echo wwww
fi
echo kkkkkkkk