Answer by devconsole for Undoing a git rebase

If you are on a branch you can use:

git reset --hard @{1}

There is not only a reference log for HEAD (obtained by git reflog), there are also reflogs for each branch (obtained by git reflog <branch>). So, if you are on master then git reflog master will list all changes to that branch. You can refer to that changes by master@{1}, master@{2}, etc.

git rebase will usually change HEAD multiple times but the current branch will be updated only once.

@{1} is simply a shortcut for the current branch, so it's equal to master@{1} if you are on master.

git reset --hard ORIG_HEAD will not work if you used git reset during an interactive rebase.