The chsh command (short for “change shell”) allows you to change the default shell for a user in Linux. Here are the steps to change your default shell using chsh: Open a terminal window Run the command cat /etc/shells, this will list the available shells on your system, make sure the shell you want to … Read more

In Linux, you can use the iptables command to manage the firewall rules. To delete a prerouting rule, you can use the -D option, followed by the table, chain, and rule number. For example, to delete a prerouting rule in the nat table, in the PREROUTING chain, with a rule number of 2, you would … Read more

UFW (Uncomplicated Firewall) is a firewall management tool for Ubuntu 20.04 LTS. It is a command-line tool that makes it easy to configure and manage iptables, the Linux kernel’s built-in firewall. Here are the steps to configure the firewall with UFW on Ubuntu 20.04 LTS: Install UFW by running the following command: sudo apt install … Read more

To install phpredis on CentOS 8 / RHEL 8, you can use the following steps: First, make sure that your system is up to date by running the command sudo yum update. Install the PHP development tools and the Redis package by running the command sudo yum install php-devel redis. Next, you will need to … Read more

There are several ways to save terminal output to a file under Linux or Unix: Using the > operator: This operator redirects the output of a command to a file. For example, to save the output of the ls command to a file named “ls_output.txt”, you would use the following command: ls > ls_output.txt Using … Read more

To change the hostname on Ubuntu 20.04, you can use the hostnamectl command. Here are the steps to change the hostname on Ubuntu 20.04: Open a terminal window on your Ubuntu 20.04 system. Check the current hostname by running the following command: hostnamectl To change the hostname, use the following command, replacing “new_hostname” with the … Read more

To uninstall a package or software on Linux using the command line, you can use the package manager specific to your distribution. Debian/Ubuntu: The package manager on Debian and Ubuntu distributions is apt, you can use the following command to uninstall a package: sudo apt remove <package-name> You can also use the following command to … Read more

To update all packages on OpenSUSE/SUSE using Ansible, you can use the zypper module. Here’s an example playbook that updates all packages on a target OpenSUSE/SUSE system: – name: Update all packages on OpenSUSE/SUSE hosts: openSUSE become: yes tasks: – name: Update all packages zypper: name: ‘*’ state: latest In this example, the zypper module … Read more

Setting up a WireGuard VPN server on CentOS 8 is a relatively simple process, and can be done by following these steps: First, enable the EPEL (Extra Packages for Enterprise Linux) repository by running the command: sudo dnf install epel-release Next, install the WireGuard package by running the command: sudo dnf install wireguard-dkms wireguard-tools After … Read more

To set up an OpenVPN server on CentOS 8 in 5 minutes, you will need to have root access to your server and have the EPEL (Extra Packages for Enterprise Linux) repository enabled. Install OpenVPN and Easy RSA: sudo yum install openvpn easy-rsa -y Create a directory for your OpenVPN server: sudo mkdir /etc/openvpn/server Copy … Read more