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You Should Know:
Here are some essential Linux commands for IT professionals, system administrators, and ethical hackers. These commands are categorized for better understanding and practical usage.
File and Directory Management
1. ls – List directory contents
ls -lha
2. cd – Change directory
cd /path/to/directory
3. pwd – Print working directory
pwd
4. mkdir – Create a directory
mkdir new_directory
5. rm – Remove files or directories
rm -rf directory_name
System Information
6. uname – Display system information
uname -a
7. top – Display system processes
top
8. htop – Interactive process viewer
htop
9. df – Disk space usage
df -h
10. free – Memory usage
free -m
Networking
11. ifconfig – Network interface configuration
ifconfig
12. ping – Test network connectivity
ping google.com
13. netstat – Network statistics
netstat -tuln
14. ssh – Secure shell remote login
ssh user@remote_host
15. scp – Secure copy files between hosts
scp file.txt user@remote_host:/path/to/destination
Security and Permissions
16. chmod – Change file permissions
chmod 755 script.sh
17. chown – Change file owner
chown user:group file.txt
18. sudo – Execute commands as superuser
sudo apt update
19. passwd – Change user password
passwd
20. iptables – Configure firewall rules
iptables -L
Text Processing
21. grep – Search text using patterns
grep "pattern" file.txt
22. awk – Pattern scanning and processing
awk '{print $1}' file.txt
23. sed – Stream editor for filtering and transforming text
sed 's/old/new/g' file.txt
24. cat – Concatenate and display file content
cat file.txt
25. tail – Display the last part of a file
tail -n 10 file.txt
Package Management
26. apt – Package handling utility (Debian-based)
sudo apt install package_name
27. yum – Package manager (RHEL-based)
sudo yum install package_name
28. dpkg – Debian package manager
sudo dpkg -i package.deb
29. rpm – RPM package manager
sudo rpm -ivh package.rpm
30. snap – Install snap packages
sudo snap install package_name
What Undercode Say:
Mastering Linux commands is crucial for IT professionals and ethical hackers. These commands not only enhance productivity but also provide deeper control over systems. Practice these commands in a safe environment to build confidence and expertise. For further learning, explore resources like Linux Command Line Basics and Advanced Linux Commands. Keep experimenting and stay curious!
References:
Reported By: Dharamveer Prasad – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
