#!/usr/bin/expect -f
log_user 1
exp_internal 0
set timeout 30
spawn ssh -v -o PreferredAuthentications=password -o PubkeyAuthentication=no -o StrictHostKeyChecking=accept-new root@192.168.3.90 "exit"
expect {
  "*assword:*" { send "123456\r"; exp_continue }
  eof
}