Set Git author config and optionally update commit author

git_config.sh

#!/bin/sh

# Set git author
export NAME = "Han Tuzun"
export EMAIL = "mail@hantuzun.com"
export GITHUB_USER = "hantuzun"

git config --global user.name $NAME
git config --global user.email $EMAIL
git config --global github.user $GITHUB_USER

# Optional: Update previous commits

export OLD_NAME = ""
export OLD_EMAIL = ""

git config alias.change-commits '!'"f() { VAR=\$1; OLD=\$2; NEW=\$3; shift 3; git filter-branch -f --env-filter \"if [[ \\\"\$\`echo \$VAR\`\\\" = '\$OLD' ]]; then export \$VAR='\$NEW'; fi\" \$@; }; f "
git change-commits GIT_AUTHOR_NAME $OLD_NAME $NAME
git change-commits GIT_AUTHOR_EMAIL $OLD_EMAIL $EMAIL
git change-commits GIT_COMMITTER_EMAIL $OLD_EMAIL $EMAIL