Harry Hill

Content Writer ( 111 Articles )

I’m Harry, the CTO of OperaVPS and a Senior Linux System Administrator with a strong background in systems engineering, DevOps, and cloud infrastructure. Since 2020, I’ve been sharing advanced insights on topics like virtualization technologies, Linux performance tuning, and secure server deployment. My focus is on delivering in-depth content for developers and professionals who want scalable, reliable, and efficient solutions.

Commands to Clear Terminal Screen in Linux

4 Commands to Clear Terminal Screen in Linux

Has it ever happened to you that you get so engrossed in working with your Linux terminal environment that you are suddenly shocked to encounter a busy screen full of various commands and get confused by viewing the crowded terminal environment?

January 15, 2026 by Harry Hill
How to Use APT Package Manager in Ubuntu

How to Use APT Package Manager in Ubuntu

As a free and open-source Linux distribution based on Debian, Ubuntu comes with a comprehensive package management system. To install, upgrade, configure, and remove software, management tools are required to manage the packages. The Advanced Packaging Tool (APT) is one of them. In this article, you will learn How to Use APT Package Manager in […]

January 11, 2026 by Harry Hill
How to Use Port Knocking in Linux to Secure SSH Server

How to Use Port Knocking in Linux to Secure SSH Server

Knock-Knock! Do you need to protect your Linux system from automated port scanners to secure the SSH server? Join us with this guide to learn How to Use Port Knocking in Linux to Secure SSH Server. By creating a connection attempt on a set of predetermined closed ports, port knocking is a technique used in […]

January 09, 2026 by Harry Hill
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