Day‑5 Linux Tutorial (2025): Group Management | Beginners to Advanced | DevOps | DevSecOps

Описание: 📘 Course Description – Day 5 (2025–2026)
Linux Beginner to Advanced Tutorial | DevOps | DevSecOps | AI & Data Engineering

Day‑5 focuses on *Group Management in Linux*. After learning how to create and manage users, we now dive into groups — a critical way to organize users, assign permissions, and streamline collaboration across projects.

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🌟 What You’ll Learn
Understanding `/etc/group`
Structure of fields (group name, GID, members)
Difference between primary and supplementary groups
How Linux uses groups for access control

Creating groups with `groupadd`
Defining new project groups
Using `-f` option to avoid errors if group exists

Modifying groups with `groupmod`
Renaming groups (`-n`)
Changing group IDs (`-g`)
Appending users (`-a -U`) vs. replacing users (`-U`)

Managing group memberships
Adding users with `usermod -aG`
Removing users with `gpasswd -d`
Editing `/etc/group` directly for bulk changes

Deleting groups with `groupdel`
Removing unused project groups
Best practices before deletion

Practical Hands‑On Demo
Creating users (`dev1`, `qa1`, `ops1`, `ds1`)
Assigning them to project groups
Renaming `ds-project` → `ai-project`
Adding/removing multiple users at once
Cleaning up groups safely

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🚀 Why It Matters
Group management ensures:
Efficient collaboration in DevOps teams
Secure access control for shared resources
Organized environments for AI/ML projects
Compliance with DevSecOps policies by grouping users logically

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