CompTIA Linux+ study guide
CompTIA Linux+ · Work through your exam, one topic at a time.
CompTIA Linux+ (V8) is a vendor-neutral certification, exam series XK0-006, that validates the ability to manage, secure, automate, and troubleshoot Linux systems in cloud and hybrid environments. It launched on July 15, 2025, and is aimed at practitioners who already have roughly 12 months of hands-on experience with Linux servers; CompTIA A+, Network+, or Server+ (or comparable knowledge) is recommended before you start. The credential is positioned for roles such as Linux systems administrator, systems engineer, and network engineer - people who support and protect the Linux platforms businesses depend on. The exam is delivered in English, contains a maximum of 90 questions mixing multiple-choice and performance-based items, and runs 90 minutes, with a passing score of 720 on a scale of 100–900. Topics on this exam: System Management, Services and User Management, Security, Automation, Orchestration, and Scripting, and Troubleshooting. The CompTIA Linux+ study guide has 5 sections and about 1,531 words.
01System Management
Know the chain: firmware (UEFI/BIOS) → GRUB2 → initramfs → systemd as PID 1. GRUB reads a generated grub.cfg; on RPM-family systems edit /etc/default/grub and regenerate rather than hand-editing the file.
310 words, about 2 min02Services and User Management
Services are units described by files in /etc/systemd/system (administrator) and /usr/lib/systemd/system (packages). After editing a unit, run systemctl daemon-reload.
292 words, about 1 min03Security
Every file has owner, group, and other bits. Octal: r=4, w=2, x=1, so 640 is rw-r-----.
299 words, about 1 min04Automation, Orchestration, and Scripting
Start with #!/bin/bash. Quote variables (" var") to survive spaces and globbing; use (...) for command substitution and $?
284 words, about 1 min05Troubleshooting
Work in order: gather symptoms, form a theory, test it, change one variable at a time, verify, document. Exam questions reward the diagnostic step, not a lucky guess.
346 words, about 2 min