rsync的安装

rsync安装，有些系统默认安装有该命令
ubuntu系统

sudo apt-get install rsync

centos系统

sudo yum install rsync

rsync参数详解

rsync提供了一些跟删除有关的参数
rsync --help | grep delete
      -del                                an alias for --delete-during
      --delete                          delete extraneous files from destination dirs
      --delete-before             receiver deletes before transfer, not during
      --delete-during             receiver deletes during transfer (default)
      --delete-delay               find deletions during, delete after
      --delete-after                receiver deletes after transfer, not during
      --delete-excluded        also delete excluded files from destination dirs
      --ignore-errors             delete even if there are I/O errors
       --max-delete=NUM    don't delete more than NUM files
其中--delete-before接收者在传输之前进行删除操作

快速删除大量文件

假如你要在linux下删除大量文件，比如100万、1000万，像/var/spool/clientmqueue/的mail邮件，/usr/local/nginx/proxy_temp的nginx缓存等，那么rm -rf *可能就不好使了。 rsync 可以用来清空目录或文件
先建立一个空目录

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