expect 命令脚本语言实战

一.expect 实现自动填入密码

1.vi ssh.exp.201

#!/usr/bin/expect

spawn ssh -p 20000 [email protected] /sbin/ifconfig eth0
set timeout 60
expect "*password:"
send "abcdef\n"
expect eof
exit

2.chmod 700 ssh.exp.201  #注。要是没有权限执行,也可以直接expect,700权限。防止其它用户查看脚本中的密码

3.执行效果：

./ssh.exp.201  
spawn ssh -p 20000 [email protected] /sbin/ifconfig eth0
[email protected]‘s password:
eth0      Link encap:Ethernet  HWaddr 00:0C:29:31:2B:A0  
          inet addr:192.168.1.201  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2417 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2419 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:229270 (223.8 KiB)  TX bytes:186485 (182.1 KiB)

二.expect语法：

exp_continue 的原理，当要提示输入时，进行匹配，当匹配成功，重新进入expect，有点象for 循环中的continue，要是没有exp_continue的话，则expect中的内容,只会对一次输入匹配一次,不论你有几个关键字

论证:

#!/usr/bin/expect

spawn ssh -p 20000 [email protected] /sbin/ifconfig eth0
set timeout 60
expect {
  -timeout 60
  "yes/no"      {exp_send "yes\r"; exp_continue}
  "*password:"  {exp_send "abcdef\r"}
  timeout {puts "expect was time out "; return}
}

expect eof
exit