nix repl

Nix expressions can be readily evaluated in the Nix repl. To start the repl, run nix repl.

[!tip] You can use `nix repl` to explore the outputs of any flake, using TAB completion:

You can use nix repl to explore any flake’s output. In the repl session below, we locate and build the aeson package:

Let’s evaluate it from the nix repl:

Let’s check that our final configuration is correct by using nix repl. In particular, we test the fileSystems set by disko: