Security

This guide outlines 22 essential practices for securing a server and includes a convenient checklist for easy reference.

This article explains three methods of generating SSH keys on a Windows system. Create SSH keys using the PuTTY tool, OpenSSH client utility, or via WSL.

The file permission feature specifies how much power each user has over a given file or directory. This tutorial explains how to read and change Linux file or directory permissions.

This article explains how to change a user password in Linux and how to force other users to change their passwords on login.

Sudo stands for superuser do. Sudo is a command used in Unix-like systems to allow a regular user to execute a program as another user. In most cases, it is the root user. Sudo gives you administrator-level permissions to run programs on your machine. This guide will show you how to create a user with sudo privileges on Debian and test the sudo access.

The Linux kernel is much like the central brain of the operating system. Although it is open-source – meaning anyone can view and modify the code – the Linux kernel is built with multiple protocols to ensure stability and security. This guide will walk you through how to check the Linux kernel version of your operating system.

Are you looking to change the root password in Ubuntu? Changing passwords is a good practice and should be done periodically. Linux allows multiple user accounts, each having its own password. Users can only change their own password. However, there is always a sudo/root (SuperUser) account. Root users can change the password of any account, including their own.

Learn how to use the su command with practical examples and explanations. Change users in the terminal window or switch to the root in a single step. This article tells you all you need to know about su.

This tutorial shows how to install Nmap on a Linux-based system and use it to retrieve valuable information from remote systems.

The Nmap hosted security tool can help you determine how well your firewall and security configuration is working. This guide will show you how to scan or check your Linux system for open ports using Nmap.