Shell script to rewrite the author of git commits

git-author-rewrite.sh

#!/bin/sh

# $1: OLD EMAIL
# $2: CORRECT NAME
# $3: CORRECT EMAIL

git filter-branch --env-filter '
OLD_EMAIL="$1"
CORRECT_NAME="$2"
CORRECT_EMAIL="$3"

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