CompTIA Linux+ Study Library
XK0-006
16 free articles on the concepts the XK0-006 exam tests, grouped by exam domain. Each one backs real questions in our practice exam.
Automation, Orchestration, and Scripting
Security
- Enforcing Linux Password Policy with pam_pwquality and pwquality.conf How pam_pwquality enforces Linux password rules: minlen, negative credit values, pwquality.conf location, and how PAM control flags change the outcome.
- journalctl Commands: Filtering, Persisting, and Rate-Limiting the systemd Journal Master journalctl: filter by unit, boot, priority, and time; make logs persistent with Storage= in journald.conf; understand rate limiting.
- Secure Data Destruction on Linux: the wipe Command and Its Alternatives What the Linux wipe command does, why rm falls short, and how shred, dd, blkdiscard, hdparm, and nvme handle secure erase for HDDs and SSDs.
Services and User Management
- systemd Targets and Runlevels: multi-user, graphical, rescue, and emergency How systemd targets replace SysV runlevels: the runlevel-to-target map, changing the default target, and when to isolate rescue vs emergency.
- systemd Timers vs Cron: Scheduling Jobs on Modern Linux systemd timers vs cron compared: timer/service unit pairs, OnCalendar and Persistent=, crontab fields, run-parts, and which scheduler to pick.
- systemd Unit Files: Service Types, Restart= Policies, and Safe Reloads Master systemd unit files: pick the right Type=, set Restart= policies that recover crashed services, and reload configs without dropping connections.
System Management
- /etc/fstab Mount Options: CIFS Shares, Credentials Files, and Recovering from a Bad Entry Build safe /etc/fstab entries for CIFS shares with credentials files, pick the right mount options, and recover when a bad line breaks boot.
- CompTIA Linux+ (XK0-006) Study Guide: Format, Domains, Cost, and How to Pass Everything on the XK0-006 exam: format, all five domains with weights, the $399 voucher, registration steps, a 6-week study plan, and test-day tactics.
- Essential vim Commands: Modes, Search and Replace, and Exiting Safely How vim's modes fit together, plus the commands Linux+ tests: :wq and :q! for exiting, yyp to duplicate a line, and :%s///g for global replace.
- Finding Files and Binaries on Linux: locate, updatedb, which, and type Why locate misses brand-new files until updatedb runs, how it differs from find, and how which, type, command -v, and whereis identify binaries.
- Fixing Broken apt Dependencies: apt --fix-broken install Explained What apt --fix-broken install actually repairs, how interrupted installs corrupt dependency state on Ubuntu/Debian, and when dpkg --configure -a helps.
- GPT Partitioning with gdisk, cgdisk, and sgdisk Learn when to use gdisk, cgdisk, and sgdisk for GPT disks, how they differ from fdisk, and how to back up a partition table before risky changes.
- initramfs, Bootloaders, and the Linux Boot Chain (Servers and Embedded Boards) Understand initramfs and the Linux boot chain from firmware to systemd, how to rebuild it on Ubuntu, and how U-Boot boots embedded ARM boards.
- Linux Archiving Tools Compared: tar, cpio, and zip/unzip tar archives paths you name; cpio reads its file list from stdin, pairing with find; unzip extracts .zip files. Syntax and exam distinctions.
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