How can I calculate the number of lines changed between two commits in Git?

To calculate the number of changed lines between two commits in Git, you can use the following methods:

1. Using the git diff command

git diff is a straightforward method for comparing differences between two commits. You can view the differences between them by specifying the hash values of the two commits.

Basic command format:

bash
git diff COMMIT_HASH1 COMMIT_HASH2 --stat

This command provides a summary of the differences between the two commits, including the number of lines added and deleted per file.

Example:

bash
git diff a1b2c3d d4e5f6g --stat

2. Using the git log command

If you want to check commits within a specific range (e.g., from a specific point to another point), you can use the git log command with the --stat option to view the file change statistics for each commit.

Basic command format:

bash
git log COMMIT_HASH1..COMMIT_HASH2 --stat

This will display the change summary for each commit between COMMIT_HASH1 and COMMIT_HASH2.

Example:

bash
git log a1b2c3d..d4e5f6g --stat

3. Using the git show command

To view the differences within a single commit, you can use git show.

Basic command format:

bash
git show COMMIT_HASH --stat

This will display the file change statistics for the specified commit.

Example:

bash
git show a1b2c3d --stat

Conclusion

These methods can effectively help you calculate the number of changed lines between two commits or within a single commit. The choice of method depends on your specific needs, such as comparing two specific commits or reviewing a range of commit history.