See where text goes when you read and write.
In this interactive Linux lesson from Stencel Academy you don't just read — you type real commands like cat notes.txt, echo hi > notes.txt, echo more >> notes.txt and watch the machine respond on a live, animated map. It is part of the free How Linux Works course.
Builds on: The Filesystem Tree.
echo done >> notes.txt — >> appends instead of replacing — the safe redirect.cat -n notes.txt — Number each line.wc -l notes.txt — Count the lines in a file.head -1 notes.txt — Just the first line.tail -1 notes.txt — Just the last line — where fresh log output lands.grep hello notes.txt — Print only the lines that match — how you search any file.