为git配置ssh，使支持多个网站（git,coding,osc

创建如下文件

~/.ssh/config

内容

Host    github.com
        HostName github.com
        User git
        PreferredAuthentications publickey
        IdentityFile ~/.ssh/privateKeyFile


Host    git.coding.net
        HostName git.coding.net
        User git
        PreferredAuthentications publickey
        IdentityFile ~/.ssh/privateKeyFile

Host    git.oschina.net
        HostName git.oschina.net
        User git
        PreferredAuthentications publickey
        IdentityFile ~/.ssh/privateKeyFile

~/.ssh/privateKeyFile 对应私钥在本地的位置。