Switch .env file for different environment build

set-env-file-for-react-script.sh

#!/usr/bin/env bash

env=$1

if ! [ $# -eq 1 ]; then
    echo "Please specify ENV"
    echo Usage:
    echo "$(basename $0)" ENV
    echo ex:
    echo "$(basename $0)" develop
    echo ""
    exit 1
fi

if ! [[ -f ".env.production.${env}" ]]; then
    echo file: .env.production."${env}" does not exit
    exit 1
fi

cp .env.production."$env" .env.production.local

Switch .env.production.local file for different build environments. e.x. develop, staging, production...
Just copy .env.production.${env} to .env.production.local.