Script testing strategies in Bash Scripting - Mini Project: Build & Apply

Script Testing Strategies

📖 Scenario: You are a system administrator who wrote a small bash script to check disk usage on your server. You want to make sure your script works correctly before using it in daily monitoring.

🎯 Goal: Build a simple bash script that checks disk usage and test it with different inputs to ensure it works as expected.

📋 What You'll Learn

Create a bash script variable with a sample disk usage value

Add a threshold variable to compare disk usage

Write a conditional statement to check if disk usage exceeds the threshold

Print a message indicating if disk usage is safe or critical

💡 Why This Matters

🌍 Real World

System administrators often write scripts to monitor server health. Testing these scripts ensures they behave correctly before deployment.

💼 Career

Knowing how to write and test bash scripts is essential for roles in system administration, DevOps, and automation engineering.

1

Create a variable with disk usage value

Create a bash variable called disk_usage and set it to the value 75 representing disk usage percentage.

Bash Scripting

# Create a variable called disk_usage and set it to 75
# Your code here

Need a hint?

Use variable_name=value syntax without spaces around the equals sign.

2

Add a threshold variable

Create a bash variable called threshold and set it to 80 to represent the critical disk usage percentage.

Bash Scripting

disk_usage=75
# Create a variable called threshold and set it to 80
# Your code here

Need a hint?

Remember to use the same syntax as before for variables.

3

Write a conditional to check disk usage

Write an if statement that compares disk_usage with threshold. If disk_usage is greater than or equal to threshold, set a variable status to "Critical". Otherwise, set status to "Safe".

Bash Scripting

disk_usage=75
threshold=80
# Write an if statement to set status to "Critical" if disk_usage >= threshold, else "Safe"
# Your code here

Need a hint?

Use [ "$disk_usage" -ge "$threshold" ] for numeric comparison in bash.

4

Print the disk usage status

Write a echo command to print the message: Disk usage status: followed by the value of the status variable.

Bash Scripting

disk_usage=75
threshold=80
if [ "$disk_usage" -ge "$threshold" ]; then
    status="Critical"
else
    status="Safe"
fi
# Print the disk usage status message
# Your code here

Need a hint?

Use echo "Disk usage status: $status" to print the message.