The Linux knowledge that actually matters in a DevOps role — not textbook theory, not exam prep. Real commands, real concepts, real confidence on the server. Learn what it means to work with the OS that runs the world's infrastructure.
Understand the FHS, work with inodes, hard/soft links, permissions, ACLs, and know exactly where things live and why.
Inspect, signal, and troubleshoot running processes. Understand foreground/background, job control, and what a zombie process actually is.
Configure interfaces, routes, firewall rules. Debug connectivity with the right tools. Know the difference between a port, a socket, and a connection.
Automate repetitive tasks with Bash. Variables, conditionals, loops, functions — write scripts that actually work and won't embarrass you in a code review.
Manage services, targets, and journals with systemctl and journalctl. Understand unit files well enough to write your own.
Configure SSH securely, manage user accounts and sudo access, understand PAM, and know what a bastion host is and when you need one.