netcheck.sh

#!/bin/bash

# Get the names of all network interfaces
config_network() {
    interfaces=$(ip -o link show | awk -F': ' '{print $2}')

    echo -e "Network Info:"
    ip -o addr show

    # Print out the interfaces and prompt the user to select one
    echo -e "\n\nAvailable network interfaces:"
    echo "$interfaces"
    echo -e "\nPlease select an interface: "
    read selected_interface

    # Validate user input
    if ! [[ $interfaces =~ $selected_interface ]]; then
      echo "Invalid selection. Exiting."
      exit 1
    fi

    ip_address=$(ip -o -4 addr list $selected_interface | awk '{print $4}')
    gateway=$(ip route | grep default | grep $selected_interface | awk '{print $3}')

    # Write the details to a file
    echo "Interface: $selected_interface"
    echo "IP Address: $ip_address"
    echo "Gateway: $gateway"

    new_ip="0.0.0.0"
    while [[ $new_ip == "0.0.0.0" ]]; do
      # Prompt the user for a new IP address
      echo -e "\nWe will set a static IP for this system to make it easier to access."
      echo -e "Please enter a new IP address (e.g., $ip_address): "
      read new_ip

      if ! [[ $new_ip =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+\/[0-9]+$ ]]; then
          echo "Invalid IP address format. Please try again."
          new_ip="0.0.0.0"
      fi
    done


    # Create a Netplan configuration file
    cat <<EOL | sudo tee /etc/netplan/01-netcfg.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    $selected_interface:
      dhcp4: no
      addresses:
        - $new_ip
      gateway4: $gateway
      nameservers:
        addresses: [8.8.8.8, 8.8.4.4]
EOL

    # Apply the new network configuration
    sudo netplan apply

    # Verify the new settings
    echo -e "\nNew Network Configuration:"
    ip -o addr show $selected_interface

    # Write the details to a file
    echo "Interface: $selected_interface" >> /opt/.net.txt
    echo "IP Address: $new_ip" >> /opt/.net.txt
    echo "Gateway: $gateway" >> /opt/.net.txt
}