不输入密码，直接用ssh登录远程linux主机的设置

摘自 http://book.douban.com/subject/3800093/
两步（存放path按default）

1 生成公匙

ssh-keygen -t rsa -C 'my key'

2 将公匙copy到server

ssh-copy-id -i .ssh/id_rsa.pub jay@server

3 如果是在macbook，没有ssh-copy-id这个命令，可以用

scp ~/.ssh/id_rsa.pub user@server:~/.ssh/authorized_keys

Keep in mind that will overwrite ~/.ssh/authorized_keys on the server if you already have it.