Not sure if any other high level languages have it, but Node.js has just added command line flags to trace precisely all env var accesses and modifications: ht

Not sure if any other high level languages have it, but Node.js has just added command line flags to trace precisely all env var accesses and modifications: https://nodejs.org/api/cli.html#--trace-env https://nodejs.org/api/cli.html#--trace-env Since you can set/unset/modify env vars in so many ways with different APIs, this sounds super useful in complex debugging scenarios.