Everything is a file. Walk the tree.
In this interactive Linux lesson from Stencel Academy you don't just read — you type real commands like ls, cd /usr, pwd, mkdir demo and watch the machine respond on a live, animated map. It is part of the free How Linux Works course.
Builds on: The Round Trip.
cd / — Jump to the root of the whole tree.cd ~ — Your home directory, from anywhere.cd /usr/sbin — Descend several levels in one step (absolute path).cd - — Toggle back to the previous directory.cd .. — Up one level to the parent.ls -a — Reveal hidden dotfiles like .bashrc and .config.ls -l — Long listing: permissions, owner, size.ls /etc — List any directory without cd-ing into it.mkdir -p projects/app/src — Create a whole directory chain in one go.rm -r demo — Delete a directory and everything inside it — no undo, no trash.find / -name passwd — Search the whole tree for a name.ls -li — Combine flags: inodes AND long format.