vim /etc/ssh/sshd_config

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find ./ -name "*.txt"|xargs  sed -i "s/xx.cn/zk1006.com/g"

*为文件格式

./为目录

s/目标字符串/要替换成的字符串/g

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deb http://mirrors.aliyun.com/debian/ stretch main contrib non-free

deb http://mirrors.aliyun.com/debian/ stretch-updates main contrib non-free

deb http://mirrors.aliyun.com/debian/ str