How-To

How to secure a Linux system

Looking to secure your Linux system? This security guide shows you how to perform system hardening and run technical audits to keep it in optimal condition.

How to become a Linux security expert?

Demand for Linux security experts has risen over the last years. This article shows the relevant Linux security topics and required skills. Do you master them?

How to see the version of Oracle Linux

Oracle Linux is based on Red Hat Enterprise Linux. At first, it may be confusing to determine what specific Oracle version of the operating system is used.

How to use grep (with examples)

Grep is a powerful utility on Linux. Want to get more out of the tool? This article will show you how to use it including many practical examples.

How to solve an expired key (KEYEXPIRED) with apt

Software updates and package management is easy, until you get a KEYEXPIRED message. In this article we should how it happens and the way to solve it.

How to see the file type?

Learn how to determine the details of most types of files on Linux, together with the understanding how these tools do their job.