#!/usr/bin/expect

set port [lindex $argv 0]
set ip   172.29.118 
set hosts /home/daya/.ssh/known_hosts

spawn rm $hosts

set timeout -1
spawn ssh root@$ip.$port
expect {
  "yes/no" {send "yes\r"}
}

set timeout 3
expect {
  "password" {send "root\r"}
}
expect eof