Rahul Sahu

FirewallD is a dynamic firewall manager for Linux systems that provides a command-line interface and a D-Bus interface for controlling and managing firewall rules. Here are the steps to set up a firewall using FirewallD on OpenSUSE Linux: Open a terminal window and log in as the root user or use the sudo command to … Read more

In CentOS Linux, you can use the yum package manager to check and list the installed packages on your system. Here are the steps to check and list installed packages: Open a terminal window and log in as the root user or use the sudo command to run the following commands. To check if a … Read more

In CentOS 7/8/9, you can create a new user account using the useradd command, which is a command-line utility for adding new users to the system. Here are the steps to create a new user account: Open a terminal window and log in as the root user or use the sudo command to run the … Read more

To install htop on CentOS Linux 8, you can use the package manager yum. First, ensure that the EPEL (Extra Packages for Enterprise Linux) repository is enabled by running the command: sudo yum install epel-release Once the EPEL repository is enabled, you can install htop by running the following command: sudo yum install htop This … Read more

In bash, you can use the basename command to extract the filename from a given path on Linux or Unix. The basename command takes the path as an argument, and returns the filename without the path. Here is an example of how to use the basename command to extract the filename from a given path: … Read more

To return the PID (process ID) of the last command in Linux or Unix, you can use the special shell variable $!. This variable contains the PID of the last background process started by the current shell. For example, if you run the command sleep 30 &, the variable $! will contain the PID of … Read more

To find the fan speed in Linux for the CPU and GPU, you can use the following commands: CPU fan speed: You can use the lm-sensors package to check the fan speed of the CPU. To install it, use the command sudo apt-get install lm-sensors (or sudo yum install lm-sensors on Fedora/CentOS). After installation, use … Read more

The “file” command is a utility that allows you to determine the type of a file based on its contents, rather than its name or extension. If you are getting the “bash: file: command not found” error, it means that the “file” package is not installed on your system. To install the “file” package on … Read more

To change the hostname of an Ubuntu 20.04 LTS system permanently, you can use the hostnamectl command. Here are the steps to change the hostname: Open a terminal window and run the command hostnamectl set-hostname new-hostname replacing “new-hostname” with the desired hostname. Verify the new hostname by running the command hostnamectl. To make the change … Read more

Upgrading Ubuntu 18.04 to 20.04 LTS using the command line involves several steps, including updating the package lists, upgrading the packages, and finally, upgrading the system to the new release. Here are the general steps to upgrade Ubuntu 18.04 to 20.04 LTS: Start by running the command sudo apt update to update the package lists. … Read more