shell 删除指定目录下过时的文件或目录

exec 1> rmfota.log 2>&1    #把输出log信息存到文件中

workdir="xx/xx"  #指定目录
num=12  #删除12天前的文件

nowDate=`date +"%Y-%m-%d %H:%M"`
start=`date -d  "$nowDate" +%s`
echo "$nowDate   $start"
for fotaDate in `ls -Al $workdir | awk '{print $6","$7","$8}'`
do
    date=`echo $fotaDate | cut -d ',' -f 1`
    time=`echo $fotaDate | cut -d ',' -f 2`
    zipfile=`echo $fotaDate | cut -d ',' -f 3`
    lastDate="$date $time"
    end=`date -d "$lastDate" +%s`
    echo "$lastDate    $end   $zipfile"
    if [ -f "$workdir/$zipfile" ];then
        diffday=`expr $(($start-$end)) / $((60*60*24))`
        echo $diffday
        if [ $diffday -gt $num ];then
            echo "remove $workdir/$zipfile"
            rm -f $workdir/$zipfile
        fi  
    fi  
done