删除 /tmp 目录下长时间未访问的文件

#!/bib/bash

DIR=/tmp
cd $DIR || {
        echo "Dir not Found: $Dir"
        exit
}

echo "Delete a file from 90 days if it is not in use, skip hidden files. "

ff="$(find /tmp -atime +90 -type f)"
num=$(echo "$ff" | wc -l)

echo "Total FIles Num: $num"

echo "$ff" | grep -v "/\."  | grep /tmp | while read f
do
        lsof $f || {
                echo "Delete this file: $f"
                find $f -delete

                num=$(($num-1))
                echo "Num of files to be Delete: $num"
        }
done