git-reset-author.sh

#!/bin/sh

# Credits: http://stackoverflow.com/a/750191
# https://gist.github.com/bgromov/a1905055a8b9cdbeb1d2a87e70920cc8

git filter-branch -f --env-filter "
    GIT_AUTHOR_NAME='John doe'
    GIT_AUTHOR_EMAIL='john.doe@example.com'
    GIT_COMMITTER_NAME='John doe'
    GIT_COMMITTER_EMAIL='john.doe@example.com'
  " HEAD
  
git push --force