Real-world Linux tutorials built from 20+ years at Goldman Sachs, Credit Suisse, and Verition. From boot sequence to security hardening โ no fluff, just what works in production.
90%+ of cloud servers, every Android phone, and the world's fastest supercomputers run Linux.
No licenses, no subscriptions, no vendor lock-in. Pure freedom, forever.
Direct, scriptable control over every part of the system via the command line.
Linux skills are required for DevOps, SRE, sysadmin, and cloud engineering roles.
BIOS โ GRUB โ Kernel โ INIT โ systemd. What really happens before you see a prompt.
Start here โManual and automated installs, partitioning, LVM, kickstart, cloud-init, and post-install config.
Read more โCheat sheet covering processes, networking, users, packages, permissions, storage, and text tools.
Read more โBash variables, loops, conditionals, functions, error handling, and real-world automation scripts.
Read more โIP config, SSH tunnels, DNS, firewall rules, routing, packet capture, and subnet calculator.
Read more โSSH hardening, SELinux, AppArmor, fail2ban, auditd, rkhunter, and an interactive hardening checklist.
Read more โService management, custom unit files, journald, timers, targets, and an AI unit file generator.
Read more โFind what's eating your disk โ a command used constantly in production:
$ du -ah /var/log | sort -rh | head -10
Summarize disk usage by directory:
$ du -sh /* 2>/dev/null | sort -rh | head -20
Spin up a Linux droplet in 60 seconds. Perfect for practicing everything in these tutorials.
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