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.

SSH Configuration Guide: Ports, Keys, and Security Hardening

SSH Configuration Guide: Ports, Keys, and Security Hardening

Linux Fundamentals /

SSH is how you manage every Linux server. If someone compromises your SSH access, they own the machine. Getting SSH configuration right is not optional — it is the foundation of server security. This guide covers practical SSH configuration: key-based authentication, port changes, client config, tunnelling, and the hardening steps that protect production servers. Part […]

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Linux File Permissions Explained: chmod, chown, and the Permission Calculator

Linux File Permissions Explained: chmod, chown, and the Permission Calculator

Linux Fundamentals /

“Permission denied.” The two words every Linux user learns to hate. But file permissions are not a barrier — they are the security model that protects everything on a Linux system. This guide explains how Linux permissions work, how to read them, how to change them, and the common permission sets you will use every

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How to Remove Files and Directories in Linux (rm, rmdir, find)

How to Remove Files and Directories in Linux (rm, rmdir, find)

Linux Fundamentals /

Deleting files in Linux is permanent. There is no recycle bin, no undo, no “are you sure?” prompt by default. One wrong command and production data disappears. This guide covers every method for removing files and directories, from the safe basics to the dangerous power tools, with clear warnings about what can go wrong. Part

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