CMD连接服务器命令（47.102.144.221 为服务器 IP）
ssh root@47.102.144.221文件上传（scp 后面参数为本地文件地址 ， 47.102.144.221 为服务器 IP， 冒号后面指 将文件上传到服务器哪个目录下）
scp D:\index.txt root@47.102.144.221:/server/tmp如何要从服务器下载文件 还是使用scp命令如下：
scp root@47.102.144.221:/server/tmp/index.txt D:\如下图：
如果连接 ssh 出现如下提示：
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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:AGHOfHIMAAhNrmTq6XsWnKxbNZco4UiovRyG50CN+Wk.
Please contact your system administrator.
Add correct host key in C:\\Users\\13160/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in C:\\Users\\13160/.ssh/known_hosts:2
ECDSA host key for 47.102.144.221 has changed and you have requested strict checking.
Host key verification failed.执行 ssh-keygen -R 47.102.144.221 删除本地密钥即可