#!/bin/bash

IP=10.2.3.$1
SSHUSER=youruser
PW=yourpassword


sed -i "/^$IP/d" /home/$USER/.ssh/known_hosts

expect << EOF
spawn ssh-copy-id $SSHUSER@$IP
expect "Are you sure you want to continue connecting (yes/no)?"
send "yes\n"
expect "password:"
send "$PW\n"
expect eof
EOF

ssh -o "StrictHostKeyChecking no" $SSHUSER@$IP