Using expect with if condtion

Ashish Sood · 07-08-2015, 11:37 AM

Hi All,

I am new to expect, to trying to automate shh login but also like to check the condition,because first time ssh will ask for confirmation to add the public key "yes/no" but next time it won't, Please check my below script and let me know if i am using it in a correct way.

Quote:

#!/usr/bin/expect
#!/bin/sh

message1="Are you sure you want to continue connecting (yes/no)?"
message2="password"

spawn ssh root@192.168.10.3

if [ expect == $message1 ]
then
send "yes\r"
expect "password"
send "redhat\r"
fi

if [ expect == $message2 ]
then
send "redhat\r"
fi

interact

Output

Quote:

root@localhost script]# ./copy1.exp
invalid command name "message1="Are"
while executing
"message1="Are you sure you want to continue connecting (yes/no)?""
(file "./copy1.exp" line 4)

sundialsvcs · 07-08-2015, 01:08 PM

A far better way would be to use SSH with digital certificates ... actually disallowing(!) password login altogether ... so that the script can connect to the host server without any sort of password challenge at all.

This would be secure, despite the absence of the password prompt: either you possess a copy of a known and acceptable (should be unique...) key, or you do not. Possession of a recognized key causes the door to open silently in front of you. Lack of a key (or, possession of a key that has been individually revoked ...) makes the door impenetrable.