How to Update CentOS IP and Hostname via Bash Script

I have created below mentioned bash script which will help you to update the IP Address and the hostname of the CentOS machines via this bash script.

#!/bin/bash

read -p "Enter the new IP address i.e: 10.50.4.243/20 : " ip_address

read -p "Enter the new gateway i.e:- 10.50.0.1 : " gateway

read -p "Enter the new hostname i.e: co7-50-4-243 : " hostname

# Get the interface name

interface=$(ip route | awk '/default/ { print $5 }')

# Get the ip address

ipa=$(hostname -I | awk '{ print $1 }')

# Update the IP address and gateway

echo "Updating IP address and gateway..."

nmcli con mod "$interface" ipv4.address "$ip_address"

nmcli con mod "$interface" ipv4.gateway "$gateway"

# Update the hostname

echo "Updating hostname..."

hostnamectl set-hostname "$hostname"

# Update the /etc/hosts file

echo "Updating /etc/hosts file..."

echo "$ipa $hostname" >> /etc/hosts

# Restart the network service

echo "Restarting network service..."

systemctl restart NetworkManager

echo "IP address, gateway, hostname, and /etc/hosts file updated successfully."