shell定期删除日志文件

#df -h | grep /dev/vda3
percent=`df -h | grep /dev/vda3 | awk '{print $5}' | head -2 | tail | grep -oP '\d+'`
echo ${percent}
if [ ${percent} -gt 80 ]
then
    #echo "大于80%"
    cd /home/fan/shell/
    rm -f localhost_access_log.*
fi