What the heck is NixOS
NixOS is a free and open source Linux distribution based on the Nix package manager. NixOS uses an immutable design and an atomic update model.[6] Its use of a declarative configuration system allows reproducibility and portability.[7]
NixOS is configured using composable modules, and relies on packages defined in the Nixpkgs project. Package recipes and configurations are written in the purpose-built "Nix language" that ships with the Nix package manager.
References
NixOS Config Examples
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