1、登入A機器
2、ssh-keygen -t [rsa|dsa]，將會在~/.ssh下生成金鑰檔案和私鑰檔案 id_rsa,id_rsa.pub或id_dsa,id_dsa.pub
3、將 .pub 檔案複製到B機器的 .ssh 目錄， 並

cat id_dsa.pub >> ~/.ssh/authorized_keys

4、大功告成，從A機器登入B機器的目標賬戶，不再需要密碼了（直接執行 #ssh 192.168.1.100 ）

面交互輸入，就得使用expect指令碼，例:

#!/bin/bash
 passwd='123456'
 /usr/bin/expect <<-EOF
 set
 
 time 30
 spawn ssh  [email protected]192.168.1.100
 expect {
 "*yes/no" { send "yes\r"; exp_continue }
 "*password:" { send "$passwd\r" }
 }
 expect "*#"
 send "cd /home/trunk\r"
 expect "*#"
 send "ls\r"
 expect "*#"
 send "exit\r"
 interact
 expect eof
 EOF