ssh命令

ssh (SSH client) is a program for logging into a remote machine and for executing commands on a remote machine.  
It is intended to provide secure encrypted communications between two untrusted hosts over an insecure network.
X11 connections, arbitrary TCP ports and UNIX-domain sockets can also be forwarded over the secure channel.

个人解读：

（1）ssh是一个远程登录连接工具；

（2）建立的是加密的安全连接

（3）使用X-Windows(X11连接)、任意的TCP端口、UNIX内置socket协议（UNIX-domain sockets），都可以接入安全信道

常用方式：

#远程连接192.168.1.1服务器，以root用户身份登录，从2222端口登录
ssh root@192.168.1.1 -p 2222

#远程连接192.168.1.100以root身份登录，执行svmon -G命令获取内存参数
ssh -l root 192.168.1.100 svmon -G

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