The Terminal: Talking to the Computer in Words

1. What your child learns and why

A terminal is a window where you type words and the computer answers in words. Your child tries six harmless commands in a simulated terminal: pwd (where am I), ls (what is here), cd (go into a folder; cd .. — one level up), mkdir (make a folder), echo (show text), clear (clear the screen). Nothing runs on your computer. The lesson also teaches the main rule: some commands, like rm, remove files — getting them back is hard, so only an adult who knows what they are doing runs them. The commands were checked in the GNU and Linux documentation (man7.org, 2 Oct 2026).

2. Three questions for dinner

• “If a computer understands only clear words, how would you explain to it how to get to your room?”
• “Why do you think there is a command that only says where you are?” (Before you set off, you need to know where you are.)
• “When did you get lost, and what helped you to find out where you were?”

3. 10 minutes together, no screen — “human terminal”

On a big sheet, draw a map of the house as a tree (“Home” → rooms → objects). On the slips write cards: pwd, ls, cd NAME, cd .., mkdir NAME, echo WORDS, clear. One of you is “the computer” — keeps a finger on a room and answers in words. The other is “the person” — holds up a card and says the command. Swap roles. Also make a red card “rm” that says “Dangerous · ask an adult · not part of the game” and put it aside.

4. What success looks like

• Your child says in words what each of the six commands does and where their “path” is in the tree.
• Explains to you why dangerous commands are left to an adult.

5. Safety

The simulator runs nothing real and saves nothing. If you want to open a real terminal, do it only on a computer that is yours, together with your child, and try only the harmless pwd and ls. Do not run rm, or commands from the internet that you do not understand, or ones that ask for administrator rights — that is for you, the adults. Ask your child not to type a name, an address or a phone number in the simulator.

6. Where to go next

Next: DB-RK-18 “Programs in Linux: Packages and Repositories”. Back: DB-RK-16.

You do not need to know the commands. Say: “Let's try it in the drawn terminal.”