Linux and the Command Line

Lessons

1. 1

   The Linux Filesystem

   Free

   Navigate the Linux filesystem confidently; understand absolute vs relative paths and 'everything is a file'.

   Beginner·30 min
2. 2

   Essential Commands

   Use ls, cp, mv, find, grep, cat, less, tail, head, wc, sort, uniq + pipes + redirection.

   Beginner·40 min
3. 3

   File Permissions

   Read and modify Linux file permissions and use sudo correctly.

   Beginner·35 min
4. 4

   Processes and systemd

   Inspect and manage Linux processes; author and operate systemd unit files.

   Beginner·40 min
5. 5

   Networking from the CLI

   Diagnose connectivity with the canonical Linux networking tools.

   Intermediate·35 min
6. 6

   Shell Scripting

   Write bash scripts with set -euo pipefail; automate real tasks.

   Intermediate·60 min
7. 7

   Environment and Configuration

   Configure shell startup files, PATH, environment variables, aliases, and version your dotfiles in Git.

   Beginner·35 min
8. 8

   SSH

   Use SSH professionally: keys, ~/.ssh/config, port forwarding, hardening.

   Beginner·40 min
9. 9

   Package Management

   Install + remove packages; enable unattended security upgrades.

   Beginner·30 min
10. 10

    Text Processing: awk, sed, cut

    Extract + transform text with the canonical Unix text tools.

    Intermediate·45 min
11. 11

    vim Basics

    Use vim well enough to edit any config file on any server: open, edit, save, quit.

    Beginner·25 min
12. 12

    Passion Project: Hardened VPS Deploy

    Spin up a $5 VPS, secure it, deploy a real web app, automate the deploy with a bash script.

    Intermediate·180 min
13. 13

    Linux + CLI Job Readiness

    Translate Linux skills into resume bullets and interview answers for junior DevOps / sysadmin / SRE roles.

    Beginner·30 min