Environment variables are a legacy mess: Let's dive deep into them

&#xA;&#xA; Programming languages have rapidly evolved in recent years. But in software&#xA;development, the new often meets the old, and the scaffolding that OS gives for&#xA;running new processes hasn’t changed much since Unix. &#xA; If you need to parametrize your application at runtime by passing a few ad-hoc&#xA;variables (without special files or a custom solution involving IPC…