Introduction to Terminal

The terminal is a text interface for your computer. Instead of clicking icons, you type commands. Instead of dragging files, you write instructions. It sounds slower — until it isn't.

Once you are fluent, the terminal is faster than any graphical tool for the kinds of tasks analysts do repeatedly: exploring files, running scripts, transforming data, deploying code.

Why data analysts use the terminal

Every tool in the modern data stack eventually meets the terminal:

• dbt runs from the terminal (dbt run, dbt test)
• Git is most reliably used from the terminal
• Python scripts are executed from the terminal
• Data files — CSVs, logs, JSON dumps — are easiest to inspect and filter from the terminal
• Cloud CLIs (BigQuery, AWS, GCP) are terminal tools

Avoiding the terminal is possible early in a data career. It becomes harder the more senior you get.

How the filesystem works

Your computer organizes files into a tree of directories (folders). At the very top is the root, written as /. Every file and directory has a unique address called a path.

/                          ← root of the filesystem
└── home/
    └── user/              ← your home directory
        ├── documents/
        │   ├── notes.txt
        │   └── projects/
        │       └── readme.md
        └── downloads/
            └── photo.jpg

A path like /home/user/documents/notes.txt describes the full address of a file starting from root. You will always be "inside" one directory at a time — this is called your working directory.

The Terminal Playground

Every lesson in this section includes an interactive terminal playground. It runs a real shell interpreter in your browser with no setup required.

Goal panel: the left side shows what you need to accomplish in this lesson. When the playground detects you have done it, the lesson is marked complete and the next one unlocks.

Filesystem panel: below the goal, the current state of the simulated filesystem updates live as you run commands. New files flash green, deleted files flash red.

Terminal: the right side is an interactive terminal. Type commands and press Enter to run them.

Hints: stuck? Click "Show hint" to reveal hints one at a time.

Reset: restores the filesystem to its starting state and clears the terminal.

Available commands

The playground understands a real subset of bash. Type help at any time to see the full list.

Category	Commands
Navigation	pwd, ls, cd
Files	touch, mkdir, cp, mv, rm
Reading	cat, head, tail, wc
Searching	grep, find
Text	sort, uniq, cut, tr
System	echo, env, export, chmod

Keyboard shortcuts

Key	Action
Enter	Run the command
↑ / ↓	Navigate command history
Tab	Autocomplete file and directory names
Ctrl+L	Clear the screen
Ctrl+C	Cancel the current input

Try it now

Run any command below to get started. A few good first commands:

ls          # list what's in the current directory
pwd         # print your current location
help        # show all available commands

The playground is below. Once you run your first command, the first lesson unlocks.