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# ssh-agent
## 说明
**ssh-agent命令** 是一种控制用来保存公钥身份验证所使用的私钥的程序。ssh-agent在X会话或登录会话之初启动所有其他窗口或程序则以客户端
程序的身份启动并加入到ssh-agent程序中。通过使用环境变量可定位代理并在登录到其他使用ssh机器上时使用代理自动进行身份验证
其实ssh-agent就是一个密钥管理器运行ssh-agent以后使用ssh-add将私钥交给ssh-agent保管其他程序需要身份验证的时候可以将验证申请
交给ssh-agent来完成整个认证过程
## 选项
```markdown
ssh-agent [-c | -s] [-d] [-a bind_address] [-t life] [command [arg ...]]
ssh-agent [-c | -s] -k
-a bind_addressbind the agent to the UNIX-domain socket bind_address.
-c生成C-shell风格的命令输出
-d调试模式
-k把ssh-agent进程杀掉
-s生成Bourne shell 风格的命令输出
-t life设置默认值添加到代理人的身份最大寿命
```
## 实例
```bash
```