Env
Env is a command-line tool or environment variable manager used to set, manage, and load environment variables for applications, often in development or deployment contexts. It helps developers configure application settings like API keys, database URLs, and secrets without hardcoding them into source code, enhancing security and portability across different environments.
Developers should learn and use Env when building applications that require configuration management across multiple environments (e.g., development, testing, production) to avoid exposing sensitive data in code repositories. It is particularly useful in DevOps workflows, containerized applications with Docker, and cloud deployments to ensure consistent and secure variable handling.