#!/usr/bin/expect -f

set user [lindex $argv 0]
set pass [lindex $argv 1]
set ip_addr [lindex $argv 2]
set new_pass [lindex $argv 3]

spawn ssh -o "StrictHostKeyChecking no" $user@$ip_addr passwd
expect "assword:"
send "$pass\r"
expect "Current password:"
send "$pass\r"
expect "password:"
send "$new_pass\r"
expect "password:"
send "$new_pass\r"
expect eof