Guides and tutorials for Linux system administration
The definitive Linux commands cheat sheet for 2026. Over 100 essential commands organized by category — file management, networking, process control, security, and more. With direct links to 51 downloadable reference guides....
Master Linux package management across all major distributions with APT, DNF, Zypper, Snap, and Flatpak. Repository management, dependency handling, and automation....
Master Linux file permissions with this comprehensive guide covering the rwx model, octal and symbolic notation, chmod, chown, chgrp commands, special permissions (SUID, SGID, sticky bit), umask defaults, Access Control Lists, directory permission differences, SELinux integration, security auditing, and professional best practices....
Master Linux backup and recovery with rsync, tar, Borg, restic, LVM snapshots, and automated backup scripts. Complete disaster recovery planning guide....
Complete guide to SSH mastery: key authentication, config files, tunneling, port forwarding, jump hosts, ProxyJump, and security hardening for production servers....
Master the difference between soft links and hard links in Linux. This guide covers inode architecture, ln command syntax, a complete comparison table, real-world use cases, and includes a free 8-page PDF cheat sheet....
Master Linux file permissions from basics to advanced ACLs. Understand octal and symbolic notation, special permissions....
Master cron from syntax to production. Complete guide covering crontab syntax, scheduling patterns, environment setup, logging, security, practical automation examples, systemd timer comparison, and troubleshooting for Linux administrators....
Master systemd from basics to advanced. Complete guide covering service management, unit files, targets, timers, journalctl logging, cgroups resource control, security sandboxing, and troubleshooting for Linux administrators....