*GIT AUTHOR REWRITES* - use at your own risk

git_author_rewrite.sh

#!/bin/bash
exit

# GIT AUTHOR AND COMMITTER REWRITES - !!!DANGEROUS!!!

# Sources:
# - https://stackoverflow.com/a/1566833
# - https://www.git-tower.com/learn/git/faq/change-author-name-email/

## REWRITE COMMITTER - BY EMAIL
#FILTER_BRANCH_SQUELCH_WARNING=1 git filter-branch -f --env-filter '
git filter-branch --env-filter '
WRONG_EMAIL="john.doe@example.com"
NEW_NAME="Jane Doh"
NEW_EMAIL="jane.doh@example.com"

if [ "$GIT_COMMITTER_EMAIL" = "$WRONG_EMAIL" ]
then
    export GIT_COMMITTER_NAME="$NEW_NAME"
    export GIT_COMMITTER_EMAIL="$NEW_EMAIL"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$WRONG_EMAIL" ]
then
    export GIT_AUTHOR_NAME="$NEW_NAME"
    export GIT_AUTHOR_EMAIL="$NEW_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags

## REWRITE AUTHOR - BY NAME
#FILTER_BRANCH_SQUELCH_WARNING=1 git filter-branch -f --env-filter '
git filter-branch --env-filter '
WRONG_NAME="John Doe"
NEW_NAME="Jane Doh"
NEW_EMAIL="jane.doh@example.com"

if [ "$GIT_AUTHOR_NAME" = "$WRONG_NAME" ]; then \
    export GIT_AUTHOR_NAME="$NEW_NAME" GIT_AUTHOR_EMAIL="$NEW_EMAIL"; \
fi
'

Sources:

• https://stackoverflow.com/a/1566833
• https://www.git-tower.com/learn/git/faq/change-author-name-email/