本文详细介绍了如何使用SSH命令连接本地主机，并解决了连接时出现的认证问题。首次连接时，系统会提示确认是否永久添加主机到已知主机列表，输入yes即可成功连接。
输入命令：ssh localhost
显示：
The authenticity of host 'localhost (127.0.0.1)' can't be established.
ECDSA key fingerprint is 34:69:fc:a8:92:c0:53:1e:06:1b:da:ef:44:1a:05:de.
Are you sure you want to continue connecting (yes/no)?
输入yes，显示：
Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.
Welcome to Ubuntu 12.04.1 LTS (GNU/Linux 3.2.0-29-generic-pae i686)
* Documentation: https://help.ubuntu.com/
Last login: Sun Jun 23 06:21:25 2013 from 192.168.159.1
说明安装成功（第一次登陆时会询问是否继续连接，输入yes即可连接）
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