Why this guide
- Built from the CompTIA Linux+ XK0-005 exam objectives — 4 weighted domains, no filler
- Command cheat sheet — the 100+ commands the exam expects you to recognize and use
- Troubleshooting decision tree — boot, network, storage, and service failures mapped to commands
- Designed for printing — full guide, two 1-page cheat sheets, and a 1-page pocket card
Who this is for
- Linux systems administrators supporting on-prem or cloud workloads
- Junior administrators moving from Windows to Linux environments
- DevOps engineers who need Linux fundamentals for containers and CI/CD
- Technical support staff troubleshooting Linux servers and desktops
- Security analysts investigating Linux endpoints, logs, and permissions
What you'll learn
- Domain 1 — System Management (26%): Kernel, boot process, storage, filesystems, partitioning, LVM, networking, users/groups, cron, logging, time sync
- Domain 2 — Security (19%): File permissions, ownership, ACLs, SELinux/AppArmor, firewalld/iptables, SSH hardening, cryptography basics, PKI, password policies
- Domain 3 — Scripting, Containers and Automation (25%): Shell scripting basics, variables, loops, conditionals, cron, systemd timers, container concepts, orchestration basics, Git fundamentals
- Domain 4 — Troubleshooting (30%): Methodology, hardware, boot issues, filesystem problems, network connectivity, service failures, performance, security incidents
- Command-line essentials: ls, find, grep, awk, sed, chmod, chown, systemctl, journalctl, ip, ss, top, ps, df, du, tar, rpm/dpkg/yum/dnf/apt
- Core concepts: FHS, runlevels/targets, systemd, environment variables, shell configuration, package management, backups
What you're getting
- 6 printable PDFs: cover, course notice, full study guide, two condensed cheat sheets, and an exam-day pocket card.
- Content built from the public syllabus and real test-taker accounts.
- No fake "actual exam" content — honest, source-cited study aids.
"Troubleshooting is the biggest domain. Know how to read logs and use journalctl."
— paraphrased from public test-taker accounts