Before completing this lab, ensure you are working in a legal and safe environment. If you haven't already, you can set up your own hacking lab by completing our first tutorial:

Setting Up Your Free Virtual Hacking Environment

Now it is time to actually start using Linux properly.

And honestly, this is where most beginners fail.

A lot of people want to jump straight into “hacking tools” without understanding the operating system they are running those tools on. That is a mistake.

If you do not understand:

• how Linux files work,
• how permissions work,
• how networking works,
• how processes work,
• or how the terminal works,

…then you are mostly just copy-pasting commands from random YouTube videos.

That is not cybersecurity.

That is pretending.

The good news is Linux is not nearly as complicated as people make it sound once you start using it every day.

This tutorial will walk you through the most important Linux commands and concepts you will constantly use inside Kali Linux.

Step 1 – Opening The Terminal

Boot up your Kali Linux VM inside VMware and log in.

Once you are on the desktop, open the terminal.

You can usually do this several ways:

• Click the terminal icon
• Right-click the desktop and select terminal
• Press:

CTRL + ALT + T

The terminal is where most real work happens in Linux.

Graphical interfaces are useful, but most cybersecurity tools are built around the command line.

Step 2 – Understanding Your Prompt

You will usually see something like this:

secret-lab@kali:~$

This tells you several things:

• secret-lab = your username
• kali = your computer hostname
• ~ = your current directory (home folder)
• $ = standard user prompt

If you are logged in as the root user, you will often see:

#

instead of:

$

That means you have elevated privileges.

Step 3 – Finding Out Where You Are

Use this command:

pwd

This stands for:

print working directory

It shows your current location in the Linux filesystem.

Example output:

/home/secret-lab

Linux systems are heavily directory-based, so understanding where you are matters constantly.

Step 4 – Listing Files and Folders

Use:

ls

This lists files and folders in the current directory.

Useful variations:

Show detailed information

ls -l

Show hidden files

ls -a

Combine both

ls -la

You will use this constantly.

Step 5 – Navigating Directories

Use:

cd

This stands for:

change directory

Move into a folder

cd Documents

Move back one directory

cd ..

Return home

cd ~

Go to root directory

cd /

The filesystem structure matters a lot in Linux.

You should learn common directories early.

Step 6 – Understanding Important Linux Directories

Home Directory

/home/

Contains user files.

Example:

/home/secret-lab

Root Directory

/

Top-level filesystem location.

Everything branches from here.

Configuration Files

/etc/

System configuration files live here.

Temporary Files

/ tmp/

Temporary data storage.

Executable Programs

/bin/

Basic Linux commands.

User Programs

/usr/

Installed applications and libraries.

Logs

/var/log/

System logs.

Very important for troubleshooting and investigations.

Step 7 – Creating Files and Folders

Create a folder

mkdir hacking-lab

Move into it

cd hacking-lab

Create a file

touch notes.txt

Verify it exists

ls

Step 8 – Viewing File Contents

Display file contents

cat notes.txt

View longer files page-by-page

less notes.txt

Inside less:

• Use arrow keys to scroll
• Press q to quit

Read the beginning of a file

head notes.txt

Read the end of a file

tail notes.txt

This becomes extremely useful when monitoring logs.

Step 9 – Editing Files

Kali includes several text editors.

A beginner-friendly one is:

nano

Example:

nano notes.txt

Type whatever you want.

To save:

CTRL + O

Press Enter.

To exit:

CTRL + X

You will edit files constantly in Linux.

Step 10 – Copying, Moving, and Deleting Files

Copy a file

cp notes.txt backup.txt

Move or rename a file

mv backup.txt old-notes.txt

Delete a file

rm old-notes.txt

Delete a directory

rmdir test-folder

Delete recursively

rm -r foldername

Be careful with rm.

Linux usually does not ask for confirmation.

Once deleted, files are often gone.

Step 11 – Understanding Permissions

Linux permissions are critical in cybersecurity.

View permissions:

ls -l

Example:

-rwxr-xr--

This looks confusing at first.

Breakdown:

• Owner permissions
• Group permissions
• Other user permissions

Permission letters:

• r = read
• w = write
• x = execute

Change permissions

chmod +x script.sh

Makes a script executable.

Change ownership

sudo chown user:user filename

Permissions are a massive part of Linux security.

Step 12 – Understanding sudo

You will constantly see:

sudo

This means:

superuser do

It temporarily runs a command with administrative privileges.

Example:

sudo apt update

Linux protects important system files from normal users.

That is a good thing.

Step 13 – Installing Software

Kali uses the APT package manager.

Update package lists

sudo apt update

Upgrade installed packages

sudo apt upgrade

Install software

sudo apt install nmap

Remove software

sudo apt remove nmap

You should update Kali regularly.

Outdated systems create problems fast.

Step 14 – Finding Files

Search for files

find / -name notes.txt

Search inside files

grep password notes.txt

This searches for the word:

password

inside the file.

grep becomes incredibly important later.

Step 15 – Networking Basics

View IP address

ip addr

Test connectivity

ping google.com

Press:

CTRL + C

to stop it.

View network connections

ss -tulnp

This shows listening services and ports.

Very useful in security work.

Step 16 – Process Management

View running processes

ps aux

Interactive process viewer

top

Kill a process

kill PID

Replace PID with the process ID.

Example:

kill 1337

Processes matter heavily in Linux security and malware analysis.

Step 17 – Downloading Files

Download with wget

wget https://example.com/file.txt

Download with curl

curl -O https://example.com/file.txt

These tools are used constantly in Linux environments.

Step 18 – Understanding Hidden Files

Files beginning with:

.

are hidden.

Example:

.bashrc

Show hidden files:

ls -la

Attackers, administrators, and normal applications all use hidden files.

Step 19 – Command History

Linux saves your command history.

View it:

history

Re-run previous commands with:

!number

Example:

!45

Be careful with this.

Step 20 – Reading Manual Pages

One of the most important Linux skills is learning how to read documentation.

Use:

man COMMAND

Example:

man ls

Press:

q

to quit.

Most beginners skip documentation.

That is why most beginners stay beginners.

Step 21 – Understanding Pipes

Pipes allow commands to work together.

Example:

ls -la | grep notes

This sends output from one command into another.

Linux becomes extremely powerful once you understand pipes.

Step 22 – Understanding Redirection

Save output to a file

ip addr > network.txt

Append output

echo "new line" >> network.txt

This becomes useful for logging and reporting.

Step 23 – Essential Beginner Mindset

Do not try to memorize every command immediately.

Nobody does.

Even experienced Linux users constantly:

• check documentation,
• use Google,
• review syntax,
• and troubleshoot mistakes.

The goal is repetition.

The more you use Linux, the more natural it becomes.

Common Beginner Mistakes

Copy-Pasting Blindly

This is one of the worst habits in cybersecurity.

Understand what commands actually do before running them.

Running Everything as Root

Do not get lazy with permissions.

Only use elevated privileges when necessary.

Ignoring Documentation

Read tool documentation.

Seriously.

Breaking Your VM

You will break things eventually.

That is normal.

That is why we built a virtual lab.

Closing Thoughts

Linux is one of the core foundations of cybersecurity.

Almost every area of ethical hacking eventually depends on understanding:

• Linux systems
• Linux networking
• Linux permissions
• Linux processes
• Linux filesystems
• Linux command-line tools

The terminal may feel uncomfortable at first, but after enough repetition, it becomes second nature.

And honestly, once you get comfortable with Linux, going back to doing technical work only through graphical interfaces feels painfully slow.

In the next tutorials, we will continue building real-world cybersecurity skills inside our Kali Linux lab.

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