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Rex Djere (744)

October 31, 2025

Enhancing an RHCSA Candidate's Cardiovascular Fitness Using the Minutely Peak Method

Executive Summary Health Note: Please talk to your doctor before you try what I'm proposing in this video/article to make sure that your…

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October 29, 2025

Why An RHCSA Candidate Must Completely Master SELinux

Executive Summary Security-Enhanced Linux, or SELinux, is a critical and misunderstood mandatory access control system that is foundational to the Red Hat Certified…

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October 29, 2025

An RHCSA-Based Overview of Firewalls on RPM and Debian-Based Computer Systems

Executive Summary This video/article provides a focused overview of firewall technology in GNU/Linux, specifically tailored for candidates preparing for the Red Hat Certified…

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October 27, 2025

What a Successful RHCSA Candidate Must Master in the Vi/Vim and Nano Text Editors

Executive Summary This video and article emphasize that proficiency in a command-line text editor is a non-negotiable skill for passing the Red Hat…

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October 25, 2025

Computer Programming in GNU/Linux: The Differences and Similarities Between the Stack and the Heap 

Executive Summary This article provides a comprehensive analysis of the stack and the heap, the two primary memory regions used by a program…

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October 23, 2025

The Histories, Similarities and Differences of the APT and DNF GNU/Linux Package Managers

Executive Summary I wrote this article to present and compare two of the most dominant package management systems in the GNU/Linux world: APT…

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