git diff between branches - Step-by-Step Execution

Process Flow - git diff between branches

Start: Two branches

↓

Run git diff branch1..branch2

↓

Git compares files

↓

Show differences line by line

↓

User sees changes between branches

Git compares the content of two branches and shows line-by-line differences.

Execution Sample

Git

git diff main..feature

Shows the differences between the 'main' branch and the 'feature' branch.

Process Table

Step	Command	Action	Result
1	git diff main..feature	Compare files in 'main' and 'feature'	Starts line-by-line comparison
2	git diff main..feature	Detect file changes	Finds files changed between branches
3	git diff main..feature	Show added lines (+) and removed lines (-)	Outputs diff with line markers
4	git diff main..feature	Finish comparison	All differences displayed
5	N/A	No more differences	Command ends

💡 All file differences between 'main' and 'feature' branches have been shown

Status Tracker

Variable	Start	After Step 2	After Step 3	Final
branch1	main	main	main	main
branch2	feature	feature	feature	feature
diff_output		files identified	lines with + and -	full diff text

Key Moments - 2 Insights

Why do some lines start with '+' and others with '-' in the diff output?

Lines starting with '+' are additions in the second branch, lines with '-' are removals compared to the first branch, as shown in execution_table step 3.

What does the '..' mean between branch names in the command?

The '..' tells git to compare the two branches, showing differences from the first branch to the second, as seen in execution_table step 1.

Visual Quiz - 3 Questions

Look at the execution table, what does step 3 show?

A The files that are identical

B The line-by-line differences with '+' and '-'

C The list of branches

D The commit history

💡 Hint

Refer to execution_table row 3 under 'Result' column

At which step does git finish showing all differences?

A Step 2

B Step 4

C Step 5

D Step 3

💡 Hint

Look at the 'Action' and 'Result' columns for step 5 in execution_table

If you swap the branch names in the command, how does the diff output change?

A The output shows differences from the new first branch to the second

B The output stays the same

C Git shows an error

D Git merges the branches

💡 Hint

Check variable_tracker for branch1 and branch2 roles and execution_table step 1

Concept Snapshot

git diff branch1..branch2
Shows line-by-line differences between two branches.
Lines starting with '+' are additions in branch2.
Lines starting with '-' are removals from branch1.
Use to review changes before merging.

Full Transcript

This visual execution shows how the git diff command compares two branches. First, git identifies the two branches to compare. Then it finds files that differ between them. Next, it shows the differences line by line, marking added lines with '+' and removed lines with '-'. Finally, it finishes when all differences are displayed. This helps users see what changed from one branch to another before merging or reviewing code.