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Bash

#!/bin/bash
# Print the ip address of the raspberry pi
current_ip=$(hostname -I | cut -d' ' -f1)
# Print the ip address
echo "The current ip address is $current_ip"
# Ask if they want to change the ip address
echo -n "Do you want to change the ip address? (Y/n) "
read change_ip
# Exit if they don't want to change the ip address
if [ "$change_ip" = "n" ]; then
exit 0
fi
# Ask if they want to use dhcp
echo -n "Do you want to use dhcp? (y/N) "
read use_dhcp
if [ "$use_dhcp" = "y" ]; then
# Set the ip address to dhcp
sudo nmcli device modify eth0 ipv4.method auto
# Restart the network
sudo nmcli c down "Wired connection 1"
sudo nmcli c up "Wired connection 1"
exit 0
fi
# Ask for the new ip address
echo -n "Enter the new ip address: "
read new_ip
# Ask for the new subnet mask
echo -n "Enter the new CIDR subnet mask (press enter for default of 24) "
read subnet_mask
if [ -z "$subnet_mask" ]; then
subnet_mask="24"
fi
# Ask for the new gateway
echo -n "Enter the new gateway (press enter for default of 192.168.25.1) "
read gateway
if [ -z "$gateway" ]; then
gateway="192.168.25.1"
fi
# Set the new ip address
sudo nmcli c mod "Wired connection 1" ipv4.addresses $new_ip/$subnet_mask ipv4.method manual
sudo nmcli c mod "Wired connection 1" ipv4.gateway $gateway
# Restart the network
sudo nmcli c down "Wired connection 1"
sudo nmcli c up "Wired connection 1"