Why Terminal?
The terminal isn't a relic. It's the most powerful interface your computer has — and the one most bootcamps skip entirely.
The Gap
Most coding education teaches you syntax in a sandboxed IDE. You write Python in a browser tab. You click “Run.” You pass the quiz. You feel productive.
Then you start your first engineering job. Someone says: “Open a terminal and clone this repo.”
And you freeze. Because nobody taught you how your computer actually works.
Students graduate without knowing how to use a terminal, version control, build systems, or package managers — the tools real engineers use every single day. This creates a painful gap that bootcamps don't talk about.
After 100+ mentoring sessions with job seekers, I've seen this pattern over and over. They have the skills. They don't have the systems.
Terminal = Your OS, Unfiltered
The terminal is the lowest-level interface to your operating system. Every file, process, network connection, and service on your machine — accessible from a single prompt.
GUIs are wrappers. Finder is ls. Activity Monitor is ps. The Settings app is defaults write. Every button you click is running a command underneath. The terminal just skips the middleman.
When you learn the terminal, you're not learning a tool — you're learning your operating system. Not an abstraction of it. The real thing.
The new reality
AI coding tools like Claude Code, GitHub Copilot CLI, and Codex all run in the terminal. They don't open VS Code for you — they read your filesystem, run your tests, commit your code, and deploy your app. They're OS-level agents that happen to write code. The engineers who know their way around a terminal are the ones who can actually use them.
What You Can Do From a Terminal
Build anything
git init → npm create → vercel deploy
Full project lifecycle. From first commit to production in one window.
Automate everything
crontab -e → bash script.sh
Cron jobs, shell scripts, CI/CD pipelines. Set it and forget it.
Debug like a pro
grep -r 'error' . | tail -20
Search logs, inspect processes, trace network calls. Fast.
Control your system
brew install → systemctl → docker run
Package management, services, containers. Your machine, your rules.
Work with AI
claude → codex → gh copilot
Every major AI coding tool is terminal-native. This is where the future lives.
Go anywhere
ssh user@server → tmux → deploy
SSH into any machine on earth. Pair program. Manage servers.
Why We Built TezCLI
We built TezCLI so you can learn the terminal the way engineers actually use it: by doing. Not by reading docs. Not by watching someone else type. By typing commands yourself and seeing what happens.
- →Real terminal sandbox in your browser — powered by WebContainers. No installs.
- →10 lessons covering the commands that matter in real jobs — from ls to shell scripting.
- →AI help when you're stuck. Not just error messages — actual explanations.
- →Free. No signup. No setup. Open the page and start typing.
$ tezcli start lesson-1
Ready to try it?
Lesson 1 takes 10 minutes. You'll learn pwd, ls, cd, mkdir, and cat. No fluff.