Question

When I first started out with this repo, I hadn’t used git before and biffed the setup by mistyping my email or something so all commits for a while were made by the user “unknown.” I found an answer on here to convert all the “unknown” commits to my name but what it actually did was duplicate the commit and apply my name. So now I have all these “unknown” user commits scattered.

So I was wondering about some commands to run to delete all commits by “unknown” user.

Answer 1

You will have to make use of git filter-branch in your repo and force push it to Github.

Here’s an example from the official docs that deals almost with the same situation where you want to remove commits by a particular user:

git filter-branch --commit-filter '
    if [ "$GIT_AUTHOR_NAME" = "Darl McBribe" ];
    then
            skip_commit "$@";
    else
            git commit-tree "$@";
    fi' HEAD

Note that this will rewrite your history and it might affect others who also use your repo. Some advice from Github:

Dealing with collaborators

You may have collaborators that pulled your tainted branch and created
their own branches off of it. After they fetch your new branch, they
will need to use git rebase on their own branches to rebase them on
top of the new one. The collab should also ensure that their branch
doesn’t reintroduce the file, as this will override the .gitignore
file. Make sure your collab uses rebase and not merge, otherwise he
will just reintroduce the file and the entire tainted history… and
likely encounter some merge conflicts.

http://help.github.com/remove-sensitive-data/