5 Linux Commands Every Cybersecurity Student Must Know

Ayesha Abbas — Sun, 28 Jun 2026 17:28:59 +0000

I'm Ayesha Abbas, a CS student, specializing
in cybersecurity and cloud security. I use Linux every
single day for my projects and studies. Here are 5 commands
that I consider absolutely essential for anyone getting
started in cybersecurity.

netstat | See All Network Connections

netstat shows you every active network connection on
your system. As a cybersecurity student this is goldmine
information.

netstat -tulpn

This shows all open ports and which process is using them.
If something suspicious is listening on a port you didn't
open, you have a problem.

grep | Find Anything Inside Files

grep searches for patterns inside files. You will use
this hundreds of times every week.

grep -r "password" /var/log/

This searches every log file for the word "password".
Useful for log analysis, finding config values, and
security auditing.

chmod | Control File Permissions

chmod controls who can read, write, or execute a file.
Wrong permissions = security vulnerability.

chmod 600 private_key.pem

This makes your SSH key readable only by you. If your
key has wrong permissions, SSH will refuse to use it.

nmap | Scan Networks Like a Pro

nmap is the most famous network scanning tool in
cybersecurity. It maps open ports and services on
any target.

nmap -sV 192.168.1.1

This scans your router and shows every open port and
what service is running on it. Essential for
understanding your network.

Note: Only scan networks you own or have permission
to scan.

ss | The Modern netstat

ss is faster and more detailed than netstat. It shows
socket statistics in real time.

ss -tulpn

Use this to quickly see what's running on your machine.
I use this every morning when I boot up my Ubuntu system.

Final Thoughts

These 5 commands are just the beginning. Linux has
hundreds of powerful tools for cybersecurity. but
master these first and you will already be ahead of
most beginners.

I am currently studying networking and Linux full time
as part of my preparation for international research
programs.

Find my projects on GitHub:
https://github.com/AyeshaAbbas-engg

Stay secure. Keep learning.
— Ayesha Abbas

DEV Community: Ayesha Abbas

5 Linux Commands Every Cybersecurity Student Must Know