ssh初学
最近注册了一个unix-center的账号，得用ssh登陆，学习了一下ssh的相关用法。lyanry大哥有篇文章简单介绍了一下ssh的基本用法。所以对于基本用法不想再说了。记一下有关ssh客户端ssh.conf的配置，以方便使用ssh登陆。
OpenSSH有三种配置方式：命令行参数、用户配置文件和系统级的配置文件（“/etc/ssh/ssh_config”）。命令行参数优先于配置文 件，用户配置文件优先于系统配置文件。所有的命令行的参数都能在配置文件中设置。因为在安装的时候没有默认的用户配置文件，所以要把需要执行
cp /etc/ssh/ss_config ~/.ssh/config
因为配置文件是按顺序读取的，所以设置的选项会先生效,配置文件可以如下写。
假如现在我在x4100.unix-center.net上有一个名为“liulang”的帐号。而且我想要把“ssh-agent”和“ssh-add”结合起来使用并且使用数 据压缩来加快传输速度。因为主机名太长了，懒得输入这么长的名字，用“dr”作为“x4100.unix-center.net”的简称。这样的话，我的配置文件可以这样写：
Host *dr HostName x4110.unix-center.net User liulang ForwardAgent yes Compression yes # Be paranoid by default Host * ForwardAgent no ForwardX11 no FallBackToRsh no这样，当我输入:
ssh dr
SSH会自动地从配置文件中找到主机的全名，用我的用户名登录并且用“ssh-agent”管理的密匙进行安全验证。很方便。 :-)
sftp也一样
sftp drssh.conf 选项
CheckHostIP yes
* 用来进行IP地址的检查以防止DNS欺骗。
CompressionLevel
* 压缩的级别从“1”（最快）到“9”（压缩率最高）。默认值为“6”。
ForwardX11 yes
2007年8月09日 19:30
不错哈，一直也没认真学习这些细节。
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