Git Git Undoing Changes 2

Question 1

How do you modify the message of the most recent commit without creating a new commit?

Accepted Answer

git commit --amend -m "new message"

Answer

`git commit --amend` replaces the most recent commit with a new one, allowing you to update the message or add more changes to it.

Question 2

After running `git commit --amend`, what happens to the original commit?

Accepted Answer

It remains accessible via git reflog until garbage collection runs

Answer

The amended commit replaces the original with a new hash, but the original is still reachable through `git reflog` until Git's garbage collector removes unreachable objects.

Question 3

Which command allows you to find and recover the hash of a commit lost after `git reset --hard`?

Accepted Answer

git reflog

Answer

`git reflog` records a history of all HEAD movements including resets, letting you find the lost commit hash and restore it with `git reset --hard <hash>`.

Question 4

How long does Git keep reflog entries accessible by default before they expire?

Accepted Answer

90 days

Answer

By default, Git keeps reflog entries for 90 days, configurable via `gc.reflogExpire` in your Git config.

Question 5

Which flag with `git revert` prevents it from automatically creating a commit, letting you stage multiple reverts as a single commit?

Accepted Answer

--no-commit

Answer

`git revert --no-commit` (or `-n`) applies the revert changes to the working tree and index without committing, so you can batch multiple reverts into one commit.

Git Practice Test

Git Practice Test

Git Git Undoing Changes 2