After understanding system identity, privileges, and package management in Day 9, Day 10 was focused on one of the most critical responsibilities of a Linux system administrator: managing users and groups.
In real-world servers—especially in cloud and enterprise environments—user access control is a key security and operational requirement.
🔹 What I Learned & Practiced
🔹 User Management in Linux
I started by learning how Linux handles users and authentication at the system level.
- useradd – Create a new user account
- passwd – Set or change a user password
- su – Switch user (including root)
- userdel – Delete a user account
✔️ This helped me understand:
- How users are created and authenticated
- Why each user has a unique UID
- How access is controlled per user
- The importance of removing unused users for security
🔹 Group Management & Permissions
Linux uses groups to simplify permission management, especially when multiple users need similar access.
- groupadd – Create a new group
- groupdel – Delete an existing group
- gpasswd -a username group – Add a user to a group
- gpasswd -d username group – Remove a user from a group
✔️ Key learnings:
- Groups make permission management scalable
- Users can belong to multiple groups
- Group-based access is widely used in production servers
- Proper group management improves security and collaboration
🔹 Why User & Group Management Matters
These concepts are essential because:
- Linux is a multi-user operating system
- Cloud servers are accessed by multiple admins, apps, and services
- Incorrect user permissions can lead to security risks
- Most DevOps and production issues involve access control
🚀 Day 10 Takeaway
Day 10 strengthened my understanding of Linux access control and security fundamentals.
I now have clarity on:
- Creating and managing users
- Switching users safely
- Assigning and revoking group permissions
- Maintaining clean and secure user access on a system
User and group management may look basic, but it forms the foundation of secure Linux administration, DevOps practices, and cloud operations.
Linux continues to feel more structured, logical, and powerful with each day of consistent learning.
Consistency is the real superpower 🔑 💪
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