#!/bin/bash

echo -e "${PURPLE}${BOLD}Enter the receiving server ip : ${RESET}"
read RECEIVING_IP
echo -e "${PURPLE}${BOLD}Enter the receiving server user : ${RESET}"
read RECEIVING_USER
echo -e "${PURPLE}${BOLD}Enter the receiving server port : ${RESET}"
read RECEIVING_PORT

if [ ! -f ~/.ssh/id_rsa ]; then
    ssh-keygen -t rsa -b 2048 -N "" -f ~/.ssh/id_rsa
fi
ssh-copy-id -p ${RECEIVING_PORT} ${RECEIVING_USER}@${RECEIVING_IP}

hostname=$(hostname)

ssh -p $RECEIVING_PORT $RECEIVING_USER@$RECEIVING_IP << EOF
    awk '/${hostname}$/ {last=\$0; count++} {lines[NR]=\$0} END {for (i=1; i<=NR; i++) if (lines[i] !~ /$(hostname)$/ || count-- == 1) print lines[i]}' /home/${RECEIVING_USER}/.ssh/authorized_keys > /home/${RECEIVING_USER}/.ssh/authorized_keys.tmp && mv /home/${RECEIVING_USER}/.ssh/authorized_keys.tmp /home/${RECEIVING_USER}/.ssh/authorized_keys
EOF