SRJahirTech

AWS + Linux Combo — Part 3: Users, Permissions & SSH Security

Running everything as root is dangerous. Real servers use proper Linux users.

Create a New User

sudo adduser devuser

Give Sudo Access

sudo usermod -aG sudo devuser

Switch User

su - devuser

File Permissions Explained

ls -l
chmod 755 file.sh
chown user:user file.sh

SSH Security Basics

• Disable root login
• Use key-based auth only
• Change default SSH port (optional)

Why This Matters

Most cloud hacks happen due to weak Linux permissions. AWS cannot save you from bad Linux practices.