Change git username/email from all commits matching a certain email

git-change-user.sh

#!/bin/sh

echo "What was your old email? [Default: email@example.com]"
read _WRONG_EMAIL
echo "What name do you want to use? [Default: newuser]"
read _NEW_NAME
echo "What email do you want to use instead? [Default: newuser@example.com]"
read _NEW_EMAIL
echo

OLD_EMAIL=${_WRONG_EMAIL:-email@example.com}
CORRECT_NAME=${_NEW_NAME:-newuser}
CORRECT_EMAIL=${_NEW_EMAIL:-newuser@example.com}

echo "Re-writing history of '${OLD_EMAIL}' to '${CORRECT_NAME}'(${CORRECT_EMAIL})"
git filter-branch --env-filter "
	if [ \"\$GIT_COMMITTER_EMAIL\" = \"${OLD_EMAIL}\" ]
	then
	    export GIT_COMMITTER_NAME=\"${CORRECT_NAME}\"
	    export GIT_COMMITTER_EMAIL=\"${CORRECT_EMAIL}\"
	fi
	if [ \"\$GIT_AUTHOR_EMAIL\" = \"${OLD_EMAIL}\" ]
	then
	    export GIT_AUTHOR_NAME=\"${CORRECT_NAME}\"
	    export GIT_AUTHOR_EMAIL=\"${CORRECT_EMAIL}\"
	fi
	" $@ --tag-name-filter cat -- --branches --tags