rsync命令快速删除大目录
https://blog.csdn.net/QYHuiiQ/article/details/107331791
rsync --delete-before -d /usr/local/newdata/ /usr/local/olddata/ --progress
https://blog.csdn.net/QYHuiiQ/article/details/107331791
rsync --delete-before -d /usr/local/newdata/ /usr/local/olddata/ --progress