Environment variables in Linux CLI - Mini Project: Build & Apply

Working with Environment Variables in Linux CLI

📖 Scenario: You are setting up a simple script environment on a Linux system. You need to create and use environment variables to store and display user information.

🎯 Goal: Learn how to create, configure, and display environment variables using Linux command line.

📋 What You'll Learn

Create an environment variable with a specific name and value

Create a secondary variable to hold a modified value

Use the main environment variable in a command

Display the value of the environment variable

💡 Why This Matters

🌍 Real World

Environment variables are used to store configuration settings and user information that scripts and programs can access easily.

💼 Career

Knowing how to manage environment variables is essential for system administrators, developers, and anyone working with Linux servers or automation scripts.

1

Create an environment variable

Create an environment variable called USER_NAME and set its value to alice using the export command.

Linux CLI

# Your code here

Need a hint?

Use export VARIABLE_NAME=value to create environment variables.

2

Create a secondary environment variable

Create another environment variable called GREETING and set its value to Hello, $USER_NAME! using the export command.

Linux CLI

export USER_NAME=alice
# Your code here

Need a hint?

Use double quotes to include variables inside strings.

3

Use the environment variable in a command

Use the echo command to display the value of the GREETING environment variable.

Linux CLI

export USER_NAME=alice
export GREETING="Hello, $USER_NAME!"
# Your code here

Need a hint?

Use echo $VARIABLE_NAME to display the value of an environment variable.

4

Display the output

Run the script and ensure the output is exactly Hello, alice!.

Linux CLI

export USER_NAME=alice
export GREETING="Hello, $USER_NAME!"
echo $GREETING
# Your code here

Need a hint?

Make sure you run the commands in a shell that supports environment variables.