The “bash: add-apt-repository: command not found” error occurs when the add-apt-repository command is not found on your Ubuntu or Debian Linux system. This command is used to add a PPA (Personal Package Archive) to your system, allowing you to install software from a specific repository. To fix this error, you will need to install the … Read more

Upgrading to a new version of Ubuntu from the command line involves the following steps: Make sure your system is up-to-date: Before you begin the upgrade process, you should ensure that your system is fully up-to-date by running the command sudo apt update and sudo apt upgrade. This will update any existing packages to the … Read more

GIMP (GNU Image Manipulation Program) is a free and open-source image editing software that can be installed on Ubuntu or Debian Linux. Here’s an example of how to install GIMP 2.10 on Ubuntu or Debian Linux: Add the GIMP PPA: To install GIMP 2.10 on Ubuntu or Debian, you will first need to add the … Read more

Setting up an OpenVPN server on Debian 11 can be done in just a few minutes by following these steps: Install OpenVPN: sudo apt update sudo apt install openvpn Generate the necessary encryption keys and certificates: sudo easyrsa init-pki sudo easyrsa build-ca sudo easyrsa build-server-full server nopass This will create the necessary keys and certificates … Read more

The “file_get_contents(): https:// wrapper is disabled in the server configuration” error message occurs when the function file_get_contents() is used to access a file over HTTPS, but the server configuration does not have the https wrapper enabled. This error occurs because PHP needs to access the file over a secure connection, but the server does not … Read more

The AWS Command Line Interface (CLI) is a unified tool to manage your AWS services. You can install the AWS CLI on Linux using pip, a package manager for Python. Here’s an example of how to install the AWS CLI on Linux: Install pip: curl -O https://bootstrap.pypa.io/get-pip.py python3 get-pip.py –user Install the AWS CLI: pip3 … Read more

You can add comments to UFW firewall rules by using the ufw command-line tool. UFW allows you to add comments to the end of a rule using the –comment option. To add a comment to an existing rule, you can use the ufw insert command to insert a new rule before an existing rule, and … Read more

The “PHP Warning: Constant ABSPATH already defined in wp-config.php” error message occurs when the ABSPATH constant is defined more than once in the wp-config.php file. The ABSPATH constant is used to define the absolute path of the WordPress installation on the server. It is defined in the wp-config.php file, and should only be defined once. … Read more

There are several ways to convert JSON to CSV using Linux or Unix shell, here are a few popular options: Using jq: jq is a command-line JSON processor that can be used to convert JSON to CSV. The basic command to convert a JSON file to CSV using jq is: jq -r ‘.’ input.json | … Read more

On FreeBSD, you can use the pkg command to backup and restore a list of installed packages. Backup installed packages: To create a backup of the currently installed packages, you can use the command pkg backup -d backup_directory. This command will create a file called “pkg-backup.txz” in the specified directory (in this case “backup_directory”) that … Read more