How to See Changes in a Specific Git Commit

To see changes in a specific commit, use the git show <commit-hash> command which displays the commit details and the changes made. Alternatively, git diff <commit-hash>^ <commit-hash> shows the differences introduced by that commit.

Syntax

The main commands to see changes in a specific commit are:

• git show <commit-hash>: Shows the commit message, author, date, and the changes made in that commit.
• git diff <commit-hash>^ <commit-hash>: Shows the difference between the commit and its parent, highlighting what was added or removed.

Here, <commit-hash> is the unique identifier of the commit you want to inspect.

bash

git show <commit-hash>
git diff <commit-hash>^ <commit-hash>

Example

This example shows how to view changes in a commit with hash abc1234. It demonstrates both git show and git diff commands.

bash

git show abc1234

git diff abc1234^ abc1234

Output

commit abc1234
Author: Jane Doe <[e-mail]>
Date:   Tue Apr 23 14:00 2024 +0000

    Fix typo in README

diff --git a/README.md b/README.md
index e69de29..b7a8c3f 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,2 @@
-Hello Wrold
+Hello World
+Added a new line

Common Pitfalls

Common mistakes when viewing commit changes include:

• Using an incorrect or incomplete commit hash, which causes errors or no output.
• Forgetting to include the caret (^) when using git diff to compare with the parent commit.
• Trying to view changes in a merge commit without specifying parents, which can be confusing.

Always copy the full commit hash or use tab completion to avoid errors.

bash

git diff abc1234
# Wrong: This compares the commit to the working directory, not its parent

git diff abc1234^ abc1234
# Right: Compares the commit to its parent to show changes introduced

Quick Reference

Command	Description
git show	Displays commit details and changes made in that commit
git diff ^	Shows differences introduced by the commit compared to its parent
git log -p -1	Shows the patch (changes) for a single commit
git diff ~1	Alternative syntax to compare commit with its parent

Key Takeaways

Use git show <commit-hash> to see commit details and changes in one command.

Use git diff <commit-hash>^ <commit-hash> to view only the changes introduced by that commit.

Always use the full or unique part of the commit hash to avoid errors.

Remember that git diff <commit-hash> alone compares the commit to the working directory, not its parent.

For merge commits, specify parent commits explicitly to see meaningful diffs.