copy_ssh_key_with_interaction.sh

#!/bin/bash

# Step 1: Prompt the user to optionally provide a password upfront
read -sp "Enter password (press Enter to skip if you want to input manually during execution): " PASSWORD
echo ""

# Define servers
servers=(
	"172.16.51.40"
	"172.16.51.86"
	"172.16.51.99"
	"172.16.51.120"
	"172.16.51.80"
	"172.16.51.6"
	"172.16.51.23"
	"172.16.51.116"
)

# Step 2: Add the servers' SSH keys to the known_hosts file using ssh-keyscan
for server in "${servers[@]}"; do
    echo "Scanning SSH key for $server and adding to known_hosts..."
    ssh-keyscan -H $server >> ~/.ssh/known_hosts
done

# Step 3: Loop through servers to copy SSH key
for server in "${servers[@]}"; do
    if [[ -z "$PASSWORD" ]]; then
        # If no password was provided, allow manual input during ssh-copy-id operation
        echo "No password provided, you will need to enter the password manually for $server."
        ssh-copy-id root@$server
    else
        # If password was provided, use sshpass to automatically pass the password
        echo "Copying SSH key to $server using provided password..."
        sshpass -p "$PASSWORD" ssh-copy-id -i /root/.ssh/id_ed25519 -o StrictHostKeyChecking=no root@$server
    fi
done