Rahul Sahu

To install the whois command on RHEL 8 / CentOS 8, you can use the package manager dnf: sudo dnf install whois This will install the whois package, which provides the whois command-line tool for querying domain name registration information. Once installed, you can use the whois command to look up information about a domain … Read more

To install wget on CentOS 8/9 using the yum/dnf command, use the following command: sudo dnf install wget You may need to run sudo dnf update before running the above command to ensure that you have the latest package list. You can also use yum instead of dnf. sudo yum install wget After installation you … Read more

The dig command is not installed by default on CentOS 8, but it can be easily installed using the package manager. Here are the steps to install dig on CentOS 8: Update the package manager: Run the following command to update the package manager and ensure that it has the latest package information: sudo dnf … Read more

There are a few ways to run a command with a time limit (timeout) on Linux. Here are a few options: Using the timeout command: The timeout command is a coreutils utility that can be used to run a command with a specified time limit. The syntax is as follows: timeout <duration> <command> For example, … Read more

To set up a firewall using FirewallD on CentOS 8, you can follow these steps: Make sure FirewallD is installed on your system by running the command: sudo yum install firewalld Start and enable the firewall service by running the commands: sudo systemctl start firewalld sudo systemctl enable firewalld To check the status of the … Read more

To protect SSH with Fail2Ban on CentOS 8, you can follow these steps: Install Fail2Ban by running the command sudo yum install fail2ban. Create a new Fail2Ban configuration file for SSH by running the command sudo nano /etc/fail2ban/jail.d/sshd.local. In the file, add the following configuration: [sshd] enabled = true port = ssh filter = sshd … Read more

Here’s how to enable and install the EPEL (Extra Packages for Enterprise Linux) repository on CentOS 8: Download the EPEL repository package by running the following command: sudo yum install epel-release Verify that the EPEL repository has been added by running the following command: yum repolist The EPEL repository should be listed among the enabled … Read more

To change the hostname on a CentOS 8 system using the command line, you can use the hostnamectl command. To set a new hostname, use the following command: sudo hostnamectl set-hostname newhostname Replace newhostname with the desired hostname for your system. To verify the hostname change, use the command: hostnamectl It will show the current … Read more

Here are the steps to upgrade Ubuntu 18.04 LTS to 20.04 LTS using the command line: Start by making sure your system is up-to-date by running the following commands: sudo apt update sudo apt upgrade Install the update-manager-core package, if it’s not already installed: sudo apt install update-manager-core Run the following command to check if … Read more

To add a new user account with admin access on Linux, use the useradd command followed by the -G option and the group name “sudo” or “admin”. For example: sudo useradd -m -G sudo newuser This will create a new user named “newuser” and add them to the “sudo” group, giving them admin access. Next, … Read more