#!/bin/bash

# Read the server list from the specified file
SERVER_LIST_FILE="servers.conf"
SERVER_LIST=()
while IFS= read -r SERVER || [ -n "$SERVER" ]; do
  SERVER_LIST+=("$SERVER")
done < "$SERVER_LIST_FILE"

# Read the public SSH key from the update server
UPDATE_SERVER="192.168.1.100" # replace with your update server IP address
PUBLIC_KEY=$(ssh username@${UPDATE_SERVER} "cat ~/.ssh/id_rsa.pub")

# Loop through the server list and add the public key to the authorized_keys file of each server
for SERVER in "${SERVER_LIST[@]}"
do
  # Establish SSH connection to remote server and add the public key to the authorized_keys file
  ssh username@${SERVER} "mkdir -p ~/.ssh && echo '${PUBLIC_KEY}' >> ~/.ssh/authorized_keys"
  echo "Public key added to authorized_keys on server ${SERVER}"
done