Updates usernames on your old git repositories.

update-usernames.sh

#!/bin/sh
###
### License: Public Domain, or the equivalent in your jurisdiction
### USE AT YOUR OWN RISK, I WILL NOT TAKE ANY RESPONSIBILITY IF YOU USED THIS AND FUCKED UP YOUR REPOSITORY.
###
### # Description
### Updates usernames on your old repositories.
###

# I know it's a bad hack but I'm too lazy to even do the replace command in an editor
$(sleep 0.2; sed -i 's/^pick/edit/g' .git/rebase-merge/git-rebase-todo)&
git rebase -i --root


while true; do
  git commit --amend --author="$(git config user.name) <$(git config user.email)>" --no-edit
  RESULT=$(git rebase --continue 2>&1)

  if [[ $RESULT == *"Successfully rebased"* ]]; then
    break
  fi
done

git log

echo "Press Enter to push, Ctrl-C to abort."
read

git push -f