how to undo git merge code example

Example 1: undo a git merge

git reset --hard HEAD~1
git reset --hard <commit_sha>

Example 2: git revert merge

git revert -m 1 <merge-commit>

Example 3: git undo merge

git reset --hard HEAD~1

Example 4: cancel a merge git

git merge --abort

Example 5: revert last merge git

git revert -m 1 commit_hash