文件夹以时间命名，比如20190917。具体处理见下：
clean_export.sh

#!/bin/sh

#rm -rf /var/spool/postfix/maildrop/*

location="/data/tingyun/shared/data/application/export/"
dt=date +%Y%m%d -d "10 days ago"

for subdir in $(ls $location);
do
if [[ "${subdir}" < "${dt}" ]]; then
rm -rf ${location}${subdir} > /dev/null;

echo ${location}${subdir};

    echo "The directory(`date`)  ${location}${subdir} has been removed."
fi

done

每天凌晨执行：

0 0 * /bin/bash /home/osoper/shellhome/clean_export.sh > /dev/null 2>&1