Dotenvx
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dotenvx get KEY --convention=flow

Return a single environment variable's value using the dotenv-flow convention

$ echo "HELLO=development local" > .env.development.local
echo "HELLO=development" > .env.development
echo "HELLO=local" > .env.local
echo "HELLO=env" > .env
echo "console.log('Hello ' + process.env.HELLO)" > index.js

dotenvx get HELLO --convention=flow
development local