Listen to this Post
Linux is a powerful operating system widely used in cybersecurity, IT, and system administration. Mastering its essential commands can significantly enhance your efficiency and productivity. Below is a comprehensive guide to fundamental Linux commands, along with practical examples and applications.
File Navigation & Management
1. `pwd` – Print working directory
pwd
2. `ls` – List directory contents
ls -la # Show hidden files with details
3. `cd` – Change directory
cd /var/log # Navigate to log directory
4. `mkdir` – Create a directory
mkdir cyber_scripts
5. `rm` – Remove files/directories
rm -r old_folder # Recursive deletion
File Operations
6. `cat` – Display file content
cat /etc/passwd
7. `cp` – Copy files
cp file.txt /backup/
8. `mv` – Move/rename files
mv old_name.txt new_name.txt
9. `grep` – Search text patterns
grep "error" /var/log/syslog
System Information & Monitoring
10. `uname` – Display system info
uname -a
11. `top` / `htop` – Process monitoring
top
12. `df` – Disk space usage
df -h
13. `free` – Memory usage
free -m
Networking Commands
14. `ifconfig` / `ip a` – Network interfaces
ip a
15. `ping` – Check connectivity
ping google.com
16. `netstat` – Network statistics
netstat -tuln
17. `ssh` – Remote login
ssh [email protected]
Permissions & Security
18. `chmod` – Change file permissions
chmod 755 script.sh
19. `chown` – Change file ownership
chown root:root file.txt
20. `sudo` – Execute as superuser
sudo apt update
Process Management
21. `ps` – List processes
ps aux
22. `kill` – Terminate a process
kill -9 1234
You Should Know:
- Compressing Files:
tar -czvf archive.tar.gz /path/to/directory
- Finding Files:
find / -name "*.conf"
- Checking Logs:
tail -f /var/log/auth.log
What Undercode Say:
Linux commands are the backbone of cybersecurity operations. Whether you’re analyzing logs, managing servers, or securing networks, mastering these commands will give you an edge. Practice them in a safe environment like Kali Linux or Ubuntu. Automate repetitive tasks with shell scripting (#!/bin/bash) and always verify commands before execution to avoid system damage.
Expected Output:
A well-structured Linux command cheat sheet for cybersecurity professionals, complete with practical examples and security best practices.
Relevant URLs:
References:
Reported By: Agbai Joseph – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
