Paths/DevOps Engineer/Linux / Filesystems & Permissions
Lock Down a Secret File
Create a secrets file with restrictive permissions. Only the owner should be able to read and write it — nobody else. This is exactly how SSH private keys work.
Validator
⏱ 0:00
IDLE — checks run live as you type commands; submit when done
01Requirements
live checks- Directory ~/secure exists○
- File ~/secure/secret.txt exists○
- Permissions on secret.txt are 600 (owner read/write only)○
02Walkthrough
1 of 6 revealed- 01
Create the directory
A dedicated directory keeps secrets out of world-readable places.
mkdir ~/secure - 5 locked · each failed submit reveals one
03Stuck?
0 of 3 revealedTake a hint without losing the lab — each one points at the thing to look at, not at the answer.
04AI Tutor
guides, never solvesTell me what you're stuck on — I'll nudge, not solve. Which requirement are you looking at?
04Notebook
saved locally in this browserlearner@lab — ubuntu:24.04
Session is disposable
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