Added day 16 tasks

Author: LondheShubham153

2026/day-16/README.md

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+# Day 16 – Shell Scripting Basics
+
+## Task
+Start your shell scripting journey — learn the fundamentals every script needs.
+
+You will:
+- Understand **shebang** (`#!/bin/bash`) and why it matters
+- Work with **variables**, **echo**, and **read**
+- Write basic **if-else** conditions
+
+---
+
+## Expected Output
+- A markdown file: `day-16-shell-scripting.md`
+- All scripts you write during the tasks
+
+---
+
+## Challenge Tasks
+
+### Task 1: Your First Script
+1. Create a file `hello.sh`
+2. Add the shebang line `#!/bin/bash` at the top
+3. Print `Hello, DevOps!` using `echo`
+4. Make it executable and run it
+
+```bash
+chmod +x hello.sh
+./hello.sh
+```
+
+**Document:** What happens if you remove the shebang line?
+
+---
+
+### Task 2: Variables
+1. Create `variables.sh` with:
+   - A variable for your `NAME`
+   - A variable for your `ROLE` (e.g., "DevOps Engineer")
+   - Print: `Hello, I am <NAME> and I am a <ROLE>`
+2. Try using single quotes vs double quotes — what's the difference?
+
+---
+
+### Task 3: User Input with read
+1. Create `greet.sh` that:
+   - Asks the user for their name using `read`
+   - Asks for their favourite tool
+   - Prints: `Hello <name>, your favourite tool is <tool>`
+
+---
+
+### Task 4: If-Else Conditions
+1. Create `check_number.sh` that:
+   - Takes a number using `read`
+   - Prints whether it is **positive**, **negative**, or **zero**
+
+2. Create `file_check.sh` that:
+   - Asks for a filename
+   - Checks if the file **exists** using `-f`
+   - Prints appropriate message
+
+---
+
+### Task 5: Combine It All
+Create `server_check.sh` that:
+1. Stores a service name in a variable (e.g., `nginx`, `sshd`)
+2. Asks the user: "Do you want to check the status? (y/n)"
+3. If `y` — runs `systemctl status <service>` and prints whether it's **active** or **not**
+4. If `n` — prints "Skipped."
+
+---
+
+## Hints
+- Shebang: `#!/bin/bash` tells the system which interpreter to use
+- Variables: `NAME="Shubham"` (no spaces around `=`)
+- Read: `read -p "Enter name: " NAME`
+- If syntax: `if [ condition ]; then ... elif ... else ... fi`
+- File check: `if [ -f filename ]; then`
+
+---
+
+## Documentation
+
+Create `day-16-shell-scripting.md` with:
+- Each script's code and output
+- What you learned (3 key points)
+
+---
+
+## Submission
+1. Add your scripts and `day-16-shell-scripting.md` to `2026/day-16/`
+2. Commit and push to your fork
+
+---
+
+## Learn in Public
+
+Share your first shell scripts on LinkedIn.
+
+`#90DaysOfDevOps` `#DevOpsKaJosh` `#TrainWithShubham`
+
+Happy Learning!
+**TrainWithShubham**