Linux Fundamentals

The Linux skills every infrastructure engineer needs, taught without assuming you already know them. Covers the file system layout, users and permissions, systemd service management, process control, networking with ip and ss, package management across distros, shell scripting, and the small set of commands that actually solve real problems. Built as a structured series so you can work through it in order or drop into any topic on demand. Whether you are sitting an RHCSA exam, preparing for a Linux admin role, or just tired of copy pasting commands you do not understand, these guides turn reference documentation into working knowledge.

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Linux File Permissions: The Interview Question Everyone Gets Wrong

Homelab Builds, Linux Fundamentals /

The Question That Ends Interviews “What does 755 mean?” I’ve seen candidates with impressive CVs stumble on this. They know Linux, they’ve used chmod, but they can’t explain what the numbers actually mean. Interview over. File permissions are the foundation of Linux security. Every file, every directory, every script you run is governed by permissions. […]

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apt Package Management on Ubuntu: Install, Update, Remove & Troubleshoot

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Linux Package Management Guide for Beginners The Gateway to Linux Administration Every piece of software on your Linux server got there somehow. In the Debian/Ubuntu world—which dominates enterprise Linux deployments—that somehow is apt. Installing packages seems simple until you’re maintaining a production server at 3 AM and an update just broke everything. Understanding apt properly

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systemctl Commands: Start, Stop & Manage Linux Services (With Real Examples)

Linux Fundamentals /

Service Management for Junior Sysadmins The Command You’ll Use More Than Any Other In my first week as a junior sysadmin, I probably ran systemctl status about fifty times a day. Application not responding? Check the service. Website down? Check the service. Database timing out? You guessed it—check the service. systemctl is the interface between

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30 Linux Commands That Get You Hired: The Interview Cheat Sheet

Homelab Builds, Linux Fundamentals /

Why This Matters for Your Career I’ve sat on both sides of the technical interview table. As a candidate, I’ve fumbled through command-line questions that should have been easy. As a hiring manager, I’ve watched promising candidates crash and burn because they couldn’t navigate a filesystem under pressure. Here’s what nobody tells you: interviewers aren’t

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