How-To

Screen is a powerful tool for working in the command line. It lets you create, monitor, and switch between several different windows. With Screen, you can multitask much like a graphical interface. It can also run in the background, waiting for you…

Learn how to set up SSH key authentication on CentOS to safely communicate with remote servers. Create the key pair, copy the public key, connect to the remote server, and disable password authentication.

Ubuntu comes pre-installed with a firewall configuration tool, UFW (Uncomplicated Firewall). This tutorial shows you how to disable and enable an Ubuntu UFW firewall using the command line.

Firewalld is a dynamically managed firewall solution that supports network zoning. As of CentOS 7, firewalld (Dynamic Firewall Manager) is the default firewall tool on CentOS servers. Admins might need to disable firewalld for testing or switching…

Cron is used to schedule scripts and commands on Linux systems. Find out where these jobs are stored and list cron jobs running on your computer. Also, use these commands to sort and display tasks scheduled through the cron tool.

The article shows you how to create a basic Python script that displays the current date and time. Find out how to use the strftime() method and the datetime module to format the information you need.

This article lists the most commonly used commands and tools to remove unwanted files and directories from your system.

This guide shows you how to fix the 'add-apt-repository command not found' error in Ubuntu. This specific Ubuntu error appears when trying to add a new software repository and indicates that the command is not installed on your system.

If a script is not written correctly, or if something unusual happens, PHP can generate an error message. The error message provides valuable insight and can point you in the right direction while troubleshooting. Follow the instructions in this…

If you are using the Sophos Central Admin platform to manage and secure your devices, you will want to activate Server Protection. Deploy Sophos agents on Linux and Windows servers, with the help of this installation guide.