一台主服务器上的部分数据文件缺失，需要在另一台备份服务器上拷贝回来，但不想使用rsync进行全局同步，因此就需要对缺失文件进行直接处理。
但文件数量比较少的时候，直接scp回来即可，但数量较多的时候，就不能人工处理了，需要使用shell脚本处理：
1. 生成缺失文件列表，如mis.txt
2. 让主服务器可以用key方式ssh到备份服务器上
3. 逐个文件导入：
while IFS='' read -r line ;do scp user@backup-server:/path/$line .; done < mis.txt
两台服务器皆为ubuntu环境。
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