实现自动SSH连接

#!/usr/bin/expect  
set timeout 10  
set username [lindex $argv 0]  
set password [lindex $argv 1]  
set hostname [lindex $argv 2]  
#set username ftpuser
#set password ftpuser
#spawn 模拟终端交互
#ssh-copy-id将本机当前用户的ssh登录公钥copy到目标机器上
# "*(yes/no)*" 返回内容包含yes/no，表示添加host到已知host
#password 表示要输入目标机器的密码
#"*please*"，"*Permission denied*" 错误，没法成功添加ssh公钥到目标机器
#"*All keys were skipped*"，"*you wanted were added*" 已添加过，则直接跳过。

spawn ssh-copy-id $username@$hostname
expect {
            "*(yes/no)*" {
				send "yes\r"; 
				exp_continue;
			}
			
            "password:" {
                send "$password\r";
				exp_continue;
            }
			"*please*" { exit 5 }
			"*All keys were skipped*" { exit }
			"*you wanted were added*" {exit }
			"*Permission denied*" { exit 6 }
        }
expect eof

#1.保存上面的代码为sh文件，并设置文件具有执行权限
#2.如下使用
./auto_ssh.sh "username" "passpord" "ip"