$ scp ~/.ssh/id_rsa.pub root@xxx.xxx.xxx.xxx:.ssh/id_rsa.pub
$ ssh root@xxx.xxx.xxx.xxx
$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
$ scp ~/.ssh/id_rsa.pub root@xxx.xxx.xxx.xxx:.ssh/id_rsa.pub
$ ssh root@xxx.xxx.xxx.xxx
$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
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