Expect script issue

Question

I am trying to accomplish a simple job via expect. I want to create ssh keys using the \"ssh-keygen\" command on Linux VMs. My below expect code looks to be straight forward

Answer 1

The spawned program is likely sending more output than exactly what you're trying to match. That's why regular expression matching is so helpful.

Try this:

spawn ssh-keygen -t rsa
expect -re {Enter file in which to save the key (/root/.ssh/id_rsa): $}
send -- "\r"
expect -re {Enter passphrase (empty for no passphrase): $}
send -- "\r"
expect -re {Enter same passphrase again: $}
send -- "\r"

Answer 2

I suppose you're exiting to quickly. This one works for me:

#!/usr/bin/expect

spawn ssh-keygen -t rsa
expect "Enter file in which to save the key (/root/.ssh/id_rsa): "
send  "\r"
expect "Enter passphrase (empty for no passphrase): "
send  "\r"
expect "Enter same passphrase again: "
send  "\r"
expect