Why diffing matters in Git - See It in Action

Why Diffing Matters in Git

📖 Scenario: You are working on a small project with a friend. You both make changes to the same file. To understand what changed, you use Git's diff feature.

🎯 Goal: Learn how to use git diff to see changes between file versions and understand why diffing helps track changes in code.

📋 What You'll Learn

Create a file with initial content

Make a change to the file

Use git diff to see the changes

Understand the output of git diff

💡 Why This Matters

🌍 Real World

Diffing is like comparing two versions of a document to see what changed. It helps developers review code before sharing it.

💼 Career

Understanding diffing is essential for collaboration in software teams, code reviews, and managing changes safely.

1

Create a file with initial content

Create a file named notes.txt with the exact content: Hello World

Git

# Create the file notes.txt with content 'Hello World'
# Your code here

Need a hint?

Use the echo command to write text to a file.

2

Make a change to the file

Add a new line with the text Welcome to Git to the file notes.txt

Git

echo "Hello World" > notes.txt
# Add a new line 'Welcome to Git' to notes.txt
# Your code here

Need a hint?

Use >> to append text to a file.

3

Initialize Git and check the diff

Initialize a Git repository with git init and then run git diff to see the changes in notes.txt

Git

echo "Hello World" > notes.txt
echo "Welcome to Git" >> notes.txt
# Initialize git repository
# Run git diff to see changes
# Your code here

Need a hint?

Use git init to start a repository and git diff to see unstaged changes.

4

Understand the diff output

Run git add notes.txt and then modify notes.txt by changing Hello World to Hello Git. Finally, run git diff to see the difference between the staged and unstaged changes.

Git

echo "Hello World" > notes.txt
echo "Welcome to Git" >> notes.txt
git init
git diff
# Add notes.txt to staging
# Change 'Hello World' to 'Hello Git' in notes.txt
# Run git diff to see unstaged changes
# Your code here

Need a hint?

Use git add to stage changes and sed to replace text in the file.