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Your .env File Is Lying to You

This video breaks down env vars from the operating system level up — where they live, how they move between processes, and why your app works locally but breaks in Docker. Environment variables aren't a framework feature — they're an OS primitive. Every process on your machine carries its own flat list of key-value strings. We'll walk through the four layers where env vars get set (OS defaults, shell profiles, manual commands, and application tooling like dotenv). Then we get into process inheritance — the reason Docker containers and CI steps don't see your local variables. Finally, we tackle the build-time vs runtime distinction. Timestamps: 0:00 Intro 0:44 What Environment Variables Actually Are 1:33 Where Do They Come From? 3:39 Process Inheritance 5:09 Build-Time vs Runtime 8:30 Recap More Videos : Software Egineering Basics -    • Software Engineering Basics   Software Design -    • Software Design   #environmentvariables #webdev #devops