Added day 11 tasks

Author: LondheShubham153

2026/day-11/README.md

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+# Day 11 – File Ownership Challenge (chown & chgrp)
+
+## Task
+Master file and directory ownership in Linux.
+
+- Understand file ownership (user and group)
+- Change file owner using `chown`
+- Change file group using `chgrp`
+- Apply ownership changes recursively
+
+---
+
+## Expected Output
+- A markdown file: `day-11-file-ownership.md`
+- Screenshots showing ownership changes
+
+---
+
+## Challenge Tasks
+
+### Task 1: Understanding Ownership (10 minutes)
+
+1. Run `ls -l` in your home directory
+2. Identify the **owner** and **group** columns
+3. Check who owns your files
+
+**Format:** `-rw-r--r-- 1 owner group size date filename`
+
+Document: What's the difference between owner and group?
+
+---
+
+### Task 2: Basic chown Operations (20 minutes)
+
+1. Create file `devops-file.txt`
+2. Check current owner: `ls -l devops-file.txt`
+3. Change owner to `tokyo` (create user if needed)
+4. Change owner to `berlin`
+5. Verify the changes
+
+**Try:**
+```bash
+sudo chown tokyo devops-file.txt
+```
+
+---
+
+### Task 3: Basic chgrp Operations (15 minutes)
+
+1. Create file `team-notes.txt`
+2. Check current group: `ls -l team-notes.txt`
+3. Create group: `sudo groupadd heist-team`
+4. Change file group to `heist-team`
+5. Verify the change
+
+---
+
+### Task 4: Combined Owner & Group Change (15 minutes)
+
+Using `chown` you can change both owner and group together:
+
+1. Create file `project-config.yaml`
+2. Change owner to `professor` AND group to `heist-team` (one command)
+3. Create directory `app-logs/`
+4. Change its owner to `berlin` and group to `heist-team`
+
+**Syntax:** `sudo chown owner:group filename`
+
+---
+
+### Task 5: Recursive Ownership (20 minutes)
+
+1. Create directory structure:
+   ```
+   mkdir -p heist-project/vault
+   mkdir -p heist-project/plans
+   touch heist-project/vault/gold.txt
+   touch heist-project/plans/strategy.conf
+   ```
+
+2. Create group `planners`: `sudo groupadd planners`
+
+3. Change ownership of entire `heist-project/` directory:
+   - Owner: `professor`
+   - Group: `planners`
+   - Use recursive flag (`-R`)
+
+4. Verify all files and subdirectories changed: `ls -lR heist-project/`
+
+---
+
+### Task 6: Practice Challenge (20 minutes)
+
+1. Create users: `tokyo`, `berlin`, `nairobi` (if not already created)
+2. Create groups: `vault-team`, `tech-team`
+3. Create directory: `bank-heist/`
+4. Create 3 files inside:
+   ```
+   touch bank-heist/access-codes.txt
+   touch bank-heist/blueprints.pdf
+   touch bank-heist/escape-plan.txt
+   ```
+
+5. Set different ownership:
+   - `access-codes.txt` → owner: `tokyo`, group: `vault-team`
+   - `blueprints.pdf` → owner: `berlin`, group: `tech-team`
+   - `escape-plan.txt` → owner: `nairobi`, group: `vault-team`
+
+**Verify:** `ls -l bank-heist/`
+
+---
+
+## Key Commands Reference
+
+```bash
+# View ownership
+ls -l filename
+
+# Change owner only
+sudo chown newowner filename
+
+# Change group only
+sudo chgrp newgroup filename
+
+# Change both owner and group
+sudo chown owner:group filename
+
+# Recursive change (directories)
+sudo chown -R owner:group directory/
+
+# Change only group with chown
+sudo chown :groupname filename
+```
+
+---
+
+## Hints
+
+- Most `chown`/`chgrp` operations need `sudo`
+- Use `-R` flag for recursive directory changes
+- Always verify with `ls -l` after changes
+- User must exist before using in `chown`
+- Group must exist before using in `chgrp`/`chown`
+
+---
+
+## Documentation
+
+Create `day-11-file-ownership.md`:
+
+```markdown
+# Day 11 Challenge
+
+## Files & Directories Created
+[list all files/directories]
+
+## Ownership Changes
+[before/after for each file]
+
+Example:
+- devops-file.txt: user:user → tokyo:heist-team
+
+## Commands Used
+[your commands here]
+
+## What I Learned
+[3 key points about file ownership]
+```
+
+---
+
+## Troubleshooting
+
+**Permission denied?**
+- Use `sudo` for chown/chgrp operations
+
+**Group doesn't exist?**
+- Create it first: `sudo groupadd groupname`
+
+**User doesn't exist?**
+- Create it first: `sudo useradd username`
+
+---
+
+## Why This Matters for DevOps
+
+In real DevOps scenarios, you need proper file ownership for:
+
+- Application deployments
+- Shared team directories
+- Container file permissions
+- CI/CD pipeline artifacts
+- Log file management
+
+---
+
+## Submission
+1. Navigate to `2026/day-11/` folder
+2. Add `day-11-file-ownership.md` with screenshots
+3. Commit and push to your fork
+
+---
+
+## Learn in Public
+
+Share on LinkedIn about mastering file ownership.
+
+Use hashtags:
+```
+#90DaysOfDevOps
+#DevOpsKaJosh
+#TrainWithShubham
+```
+
+Happy Learning
+**TrainWithShubham**