Why environment setup customizes the shell in Linux CLI - See It in Action

Why Environment Setup Customizes the Shell

📖 Scenario: You just started using a Linux terminal. You notice that when you open the terminal, some commands work differently or some shortcuts are available. This happens because the shell environment is customized when it starts.Understanding how environment setup customizes the shell helps you control your terminal experience and automate tasks.

🎯 Goal: Learn how to create and use environment variables to customize your shell behavior.You will create a simple environment variable, then use it in a command to see how it changes the shell's behavior.

📋 What You'll Learn

Create an environment variable in the shell

Use the environment variable in a command

Print the environment variable value

💡 Why This Matters

🌍 Real World

Customizing the shell environment helps users and developers work faster by setting shortcuts, colors, and useful information in the terminal prompt.

💼 Career

Many IT and developer jobs require configuring shell environments to improve productivity and automate workflows.

1

Create an environment variable

Create an environment variable called MY_SHELL_VAR and set its value to custom_value using the export command.

Linux CLI

# Create the environment variable MY_SHELL_VAR with value custom_value
# Your code here

Need a hint?

Use export VARIABLE_NAME=value to create environment variables in the shell.

2

Use the environment variable in a command

Use the echo command to display the value of the environment variable MY_SHELL_VAR. Use the syntax $MY_SHELL_VAR to access its value.

Linux CLI

export MY_SHELL_VAR=custom_value
# Use echo to print the value of MY_SHELL_VAR
# Your code here

Need a hint?

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

3

Customize shell prompt using the environment variable

Change the shell prompt by setting the PS1 variable to include the value of MY_SHELL_VAR. Use PS1="[$MY_SHELL_VAR] $ " to show the variable in the prompt.

Linux CLI

export MY_SHELL_VAR=custom_value
echo $MY_SHELL_VAR
# Set PS1 to show [custom_value] as the prompt
# Your code here

Need a hint?

The PS1 variable controls the shell prompt. You can include environment variables inside it.

4

Show the customized shell prompt

Print the current value of the shell prompt variable PS1 using the echo command.

Linux CLI

export MY_SHELL_VAR=custom_value
echo $MY_SHELL_VAR
PS1="[$MY_SHELL_VAR] $ "
# Print the PS1 variable
# Your code here

Need a hint?

Use echo $PS1 to see the current shell prompt setting.