Nix / NixOS

I know that if using flakes nix shell is the right command. But I just want to know that is it normal for legacy commands to not work like that one? nix-env works tho.

• Dotfiles

• One thing to note is that, what I am doing temporarily is running it using this

nix shell nixpkgs#nix-info
nix-info

• And the output value is this

 - system: `"x86_64-linux"`
 - host os: `Linux 6.1.86, NixOS, 23.11 (Tapir), 23.11.20240417.e402c3e`
 - multi-user?: `no`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.1`
 - nixpkgs: `not found`

• Notice the nixpkgs: not found, This is also weird to me.

• logs ->

error:
       … while calling anonymous lambda

         at «string»:1:1:

            1| {...}@args: with import <nixpkgs> args; (pkgs.runCommandCC or pkgs.runCommand) "shell" { buildInputs = [ (nix-info) ]; } ""
             | ^

       error: file 'nixpkgs' was not found in the Nix search path (add it using $NIX_PATH or -I)

       at «none»:0: (source not available)