NixOS: Recovering a Deleted configuration.nix from Earlier Generations
Accidentally deleted your configuration.nix file? Here is how to locate your system configuration in the Nix store and protect it for the future.
NixOS
Using Zsh Instead of Bash with Nix develop: How to Switch Shells
By default, nix develop launches Bash. With just a few tweaks, you can make your Nix development environment use your preferred shell directly.