nixos-combined-flake/modules/nixos/base/programs/default.nix

{ pkgs, ... }:
{
  environment = {
    systemPackages = with pkgs; [
      vim
      git
      openssh
      file
      w3m
      btop
      iftop
      iotop
      ncdu
      wget
      openssl
    ];
    etc = {
      "ncdu.conf".text = ''
        --color dark
      '';
    };
  };

  programs = {
    zsh.enable = true;
    command-not-found.enable = false;
  };
}