git reset all authors

doit.bash

#!/usr/bin/env bash

# disable warning for using filter branch, we don't care lalala
export FILTER_BRANCH_SQUELCH_WARNING=1

# rewrite all authors to = committer.
git filter-branch --commit-filter \
'GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE" GIT_AUTHOR_EMAIL="$GIT_COMMITTER_EMAIL" git commit-tree "$@"'

# these are good examples:
# https://git-scm.com/docs/git-filter-branch#_examples
# if you wanted to eg do a replace on certain author email:
git filter-branch --commit-filter '
	if [ "$GIT_AUTHOR_EMAIL" = "<[email protected]>" ];
	then
		GIT_AUTHOR_EMAIL="<[email protected]>" git commit-tree "$@";
	else
		git commit-tree "$@";
	fi' HEAD