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Linux essentials

Beginner7 sections · 25 lessons · ~7h total · 80-question self-test
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01

The shell & filesystem

3 lessonsTest yourself
01The shell & navigatingWhere you are, moving around, getting help.12 min02Working with files & textview, find, grep, pipes, redirection.14 min03The filesystem hierarchyWhat lives where, and why it matters.10 min
02

Command reference

6 lessonsTest yourself
01File & directory commandsls, cd, cp, mv, rm, mkdir, touch, ln — with output.16 min02Viewing & editing filescat, less, head, tail, wc, nano, vim.14 min03Text processinggrep, sed, awk, sort, uniq, cut, tr.16 min04Finding files & commandsfind, locate, which, whereis, xargs.12 min05Archiving, compression & transfertar, gzip, zip, scp, rsync, curl, wget.14 min06System info & monitoringdf, du, free, uname, uptime, date, who.14 min
03

Everyday shell

4 lessonsTest yourself
01Environment variables & PATHexport, $VAR, .bashrc, and how $PATH works.12 min02Connecting with SSHssh, keys, scp — reach a remote server.12 min03Wildcards, aliases & shortcutsGlobbing, tab-completion, history, chaining.12 min04Scheduling tasks with cronRun things automatically on a schedule.12 min
04

Permissions & ownership

3 lessonsTest yourself
01Reading & setting permissionsrwx, octal, and chmod at a glance.14 min02Ownership: users & groups on fileschown, chgrp, and who can do what.10 min03SUID, SGID, sticky & umaskThe special bits attackers look for.12 min
05

Users, groups & sudo

2 lessonsTest yourself
01Accounts: passwd, shadow, groupsHow Linux knows who you are.12 min02sudo & least privilegeGrant exactly what is needed, attributably.12 min
06

Processes & services

4 lessonsTest yourself
01Processes & /procps, top, and what a process really is.12 min02Signals: kill, TERM vs KILLAsk nicely before you force it.10 min03systemd units & timersStart, enable, and inspect services.14 min04Logs with journaldFind the log you need, fast.12 min
07

Networking & packages

3 lessonsTest yourself
01Networking basicsip, ss, ports, and sockets.14 min02Packages & signed reposapt/dnf, GPG-signed repos, updates.12 min03Where to go nextFrom fluency to hardening.6 min
Final exam
Test yourself on everything
80 questions drawn from all 7 sections — every answer explained as you pick.
Start final exam