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Day 09 – Linux User & Group Management Challenge

Task

Today's goal is to practice user and group management by completing hands-on challenges.

Figure out how to:

  • Create users and set passwords
  • Create groups and assign users
  • Set up shared directories with group permissions

Use what you learned from Days 1-7 to find the right commands!

Expected Output

  • A markdown file: day-09-user-management.md
  • Screenshots of command outputs
  • List of commands used

Challenge Tasks

Task 1: Create Users (20 minutes)

Create three users with home directories and passwords:

  • tokyo
  • berlin
  • professor

Verify: Check /etc/passwd and /home/ directory

Task 2: Create Groups (10 minutes)

Create two groups:

  • developers
  • admins

Verify: Check /etc/group

Task 3: Assign to Groups (15 minutes)

Assign users:

  • tokyo → developers
  • berlin → developers + admins (both groups)
  • professor → admins

Verify: Use appropriate command to check group membership

Task 4: Shared Directory (20 minutes)

  1. Create directory: /opt/dev-project
  2. Set group owner to developers
  3. Set permissions to 775 (rwxrwxr-x)
  4. Test by creating files as tokyo and berlin

Verify: Check permissions and test file creation

Task 5: Team Workspace (20 minutes)

  1. Create user nairobi with home directory
  2. Create group project-team
  3. Add nairobi and tokyo to project-team
  4. Create /opt/team-workspace directory
  5. Set group to project-team, permissions to 775
  6. Test by creating file as nairobi

Hints

Stuck? Try these commands:

  • User: useradd, passwd, usermod
  • Group: groupadd, groups
  • Permissions: chgrp, chmod
  • Test: sudo -u username command

Tip: Use -m flag with useradd for home directory, -aG for adding to groups

Documentation

Create day-09-user-management.md:

# Day 09 Challenge

## Users & Groups Created
- Users: tokyo, berlin, professor, nairobi
- Groups: developers, admins, project-team

## Group Assignments
[List who is in which groups]

## Directories Created
[List directories with permissions]

## Commands Used
[Your commands here]

## What I Learned
[3 key points]

Troubleshooting

Permission denied? Use sudo

User can't access directory?

  • Check group: groups username
  • Check permissions: ls -ld /path cd

Submission

  1. Fork this 90DaysOfDevOps repository
  2. Navigate to 2026/day-09/ folder
  3. Add your day-09-user-management.md with screenshots
  4. Commit and push

Learn in Public

Share your Day 09 progress on LinkedIn:

  • Post about completing the user management challenge
  • Share one thing you figured out
  • Mention real-world DevOps use

Use hashtags:

#90DaysOfDevOps
#DevOpsKaJosh
#TrainWithShubham

Happy Learning TrainWithShubham