How can I rollback a github repository to a specific commit?

Question

My github has 100 commits in it right now. I need to rollback the repository to commit 80, and remove all the subsequent ones.

Why? This repo is supposed to be fo

Answer 1

When doing branch updates from master, I notice that I sometimes over-click, and cause the branch to merge into the master, too. Found a way to undo that.

If your last commit was a merge, a little more love is needed:

git revert -m 1 HEAD