Function definition in Bash Scripting - Mini Project: Build & Apply

Function definition

📖 Scenario: You are creating a small bash script to greet users by name. This script will use a function to keep the greeting message reusable and neat.

🎯 Goal: Build a bash script that defines a function called greet which takes a name as input and prints a greeting message. Then call this function with a specific name.

📋 What You'll Learn

Create a function named greet

The function should accept one argument (a name)

The function should print Hello, <name>! where <name> is the argument

Call the greet function with the name Alice

Print the greeting message to the terminal

💡 Why This Matters

🌍 Real World

Functions in bash scripts help automate repetitive tasks like sending messages, processing files, or managing system settings.

💼 Career

Knowing how to write and use functions in bash is essential for system administrators, DevOps engineers, and anyone automating tasks on Linux or Unix systems.

1

Create a function named greet

Write a bash function named greet that takes one argument called name. Inside the function, write a comment # Function to greet a user.

Bash Scripting

# Function to greet a user
function greet() {
    # Your code here
}

Need a hint?

Start your function with function greet() { and end with }. Use a comment inside the function.

2

Add code to print a greeting message inside the greet function

Inside the greet function, write a echo command that prints Hello, <name>! where <name> is the first argument passed to the function, accessed as $1.

Bash Scripting

function greet() {
    # Function to greet a user
    # Your code here
}

Need a hint?

Use echo "Hello, $1!" to print the greeting with the first argument.

3

Call the greet function with the name Alice

After the function definition, call the greet function with the argument Alice to print the greeting.

Bash Scripting

function greet() {
    # Function to greet a user
    echo "Hello, $1!"
}

# Your code here

Need a hint?

Call the function by writing greet Alice after the function.

4

Print the greeting message

Run the script so that it prints the greeting message Hello, Alice! to the terminal.

Bash Scripting

# Your code here

Need a hint?

Make sure you run the script and see the output Hello, Alice! in the terminal.