Take the 2-minute tour ×
Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

I have the follow expect script which adds a known host if a known host does not exist.

spawn ssh user@domain "cd /home/user"
expect "Are you sure you want to continue connecting (yes/no)?"
send "yes\r"

The script works fine the first time I ssh into a device however if I ssh into a device for a nth + 1 time, it throws an error

send: spawn id exp6 not open
    while executing
"send "yes\r""
    (file "./testing_spawn.sh" line 4)

presumably because it continues to expect the string Are you sure you want to continue connecting (yes/no)?

How can I tell the script to just interact if that message does not show up?

share|improve this question
I'm not familiar with expect, from what I saw [here][1] you can do like that: expect "Are you sure you want to continue connecting (yes/no)?" { send "yes\r" } [1]: thegeekstuff.com/2010/10/expect-examples –  RSFalcon7 Mar 21 '13 at 2:53

1 Answer 1

try this:



#!/usr/bin/expect -f
set ip [lindex $argv 0]

spawn ssh -q $ip
expect {
  timeout { send_user "\nFailed\n"; exit 1 }
  eof { send_user "\nSSH failure for $ip\n"; exit 1 }
  "Password:" {
    send "password\n"
  "*(yes/no)?*" {
    send "yes\n"
  "*#" {
share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.