Navigating and Managing Files | IT Foundations for Beginners

In this chapter

We'll learn the everyday commands for moving around and managing files: pwd, cd, ls, mkdir, touch, cp, mv and rm — including the one command you must always use carefully.

12–14 min

The Problem in Real Life

The prompt says anna@staging:~$. Anna wants to get to /var/log/blueticket, look around, and keep a copy of the log on the side so she doesn't touch the real one.

"Eight commands," John says. "That's all you need to move around and manage files on any Linux machine. And one of them can't be undone — so we'll learn that one slowly."

On a server, there's no recycle bin. A deleted file is gone.

John

Clicking in a File Explorer vs. Typing Commands

Where am I? What's here?

Without a window, you need commands to see your current folder and what's in it.

Create, copy, move

Everything you do with a mouse in a file explorer has a short command.

Deleting is forever

rm doesn't move files to a recycle bin — they're removed immediately.

Moving Around and Managing Files

Here are the eight commands, in the order you'll usually need them. Each one is short for an English word, which makes them easier to remember.

pwd — print working directory. Shows where you are right now. When you're lost, type pwd.
cd — change directory. Moves you to another folder. cd /var/log/blueticket (absolute path), cd logs (relative path), cd .. (up one level), cd ~ or just cd (back home), cd - (back to the previous folder).
ls — list. Shows the files and folders in the current directory. Useful options: ls -l (details: permissions, owner, size, date), ls -a (include hidden files), ls -lh (sizes in readable units like K, M, G). Options can be combined: ls -lah.
mkdir — make directory. Creates a new folder: mkdir notes. Add -p to create several levels at once: mkdir -p notes/week6.
touch — creates a new, empty file (or updates the time on an existing one): touch todo.txt.
cp — copy. cp app.log ~/app-copy.log copies a file. To copy a whole folder with everything inside, add -r (recursive): cp -r logs ~/logs-backup.
mv — move. Moves a file to another place: mv report.txt notes/. It's also how you rename: mv old.txt new.txt.
rm — remove. Deletes a file: rm old.txt. To delete a folder and everything in it: rm -r folder. There is no recycle bin and no undo.

Table — The eight everyday commands

Command	Short for	Example	What it does
pwd	print working directory	pwd	Shows your current folder
cd	change directory	cd /var/log	Moves to another folder
ls	list	ls -lah	Lists files, with details and hidden files
mkdir	make directory	mkdir -p notes/week6	Creates folders
touch	—	touch todo.txt	Creates an empty file
cp	copy	cp -r logs backup	Copies files or folders
mv	move	mv old.txt new.txt	Moves or renames
rm	remove	rm -i old.txt	Deletes — no undo

Table — cd shortcuts

Command	Goes to
cd ..	The parent folder (one level up)
cd ../..	Two levels up
cd ~ or cd	Your home folder
cd -	The folder you were in before
cd /	The root of the file system

Anna's session on staging

pwd
# /home/anna

cd /var/log/blueticket
pwd
# /var/log/blueticket

ls -lh
# -rw-r--r-- 1 blueticket blueticket 148M Nov 14 10:42 app.log
# -rw-r--r-- 1 blueticket blueticket 201M Nov 13 23:59 app.log.1
# -rw-r--r-- 1 blueticket blueticket 2.3M Nov 14 10:40 error.log

cp app.log ~/app-today.log     # a safe copy to work with
mkdir -p ~/notes/week6         # a folder for her notes

Being careful with rm: John gives Anna three rules. First, run pwd and ls before deleting, so you know exactly where you are and what's there. Second, use rm -i while learning — it asks "remove this?" for each file. Third, be extremely careful with rm -rf (remove, recursive, force, no questions) — especially with sudo and especially with paths like / or *. People have deleted whole servers with one typo.

Two habits that save time: press Tab to auto-complete file and folder names (type cd /var/lo then Tab, and the shell fills in log/), and press the up arrow to bring back previous commands instead of typing them again.

On Windows: PowerShell understands most of these same names (pwd, cd, ls, mkdir, cp, mv, rm) as shortcuts for its own commands, so what you learn here mostly works there too. Command Prompt uses different words (dir, copy, move, del).

Anna types her way there: cd /var/log/blueticket, then pwd to check, then ls -lh. Three files: app.log (148M), app.log.1 (yesterday's) and error.log. To be safe, she copies today's log to her home folder before doing anything else: cp app.log ~/app-today.log.

Key Takeaway

Eight commands cover most file work: pwd (where am I), cd (go somewhere), ls (what's here), mkdir and touch (create), cp (copy), mv (move or rename) and rm (delete). rm has no undo — always check where you are first, and treat rm -rf with great care.

Why This Matters

These eight commands are the alphabet of every server you'll ever touch. Deploying an app, cleaning up a full disk (Act 05's checkpoint), finding a config file, backing up data — all of it starts here. And the rm rules aren't just advice: being careful with destructive commands is one of the first things senior engineers judge in a junior.

Anna is in the right folder, with a safe copy of the log. But app.log is 148 MB — about 200,000 lines. She can't scroll through that looking for one error. She needs commands that read files smartly.