anchor.diff:          if [ -n "$__ETC_ZSHENV_SOURCED" ]; then return; fi
           export __ETC_ZSHENV_SOURCED=1
   
  -        export NIX_PATH=nixpkgs=$HOME/.nix-defexpr/nixpkgs
  +        export NIX_PATH=nixpkgs=$HOME/.nix-defexpr/nixpkgs:$NIX_PATH/.nix-defexpr/channels_root
   
           # Set up secure multi-user builds: non-root users build through the
           # Nix daemon.
  
positive.code:           serviceConfig.RunAtLoad = true;
            serviceConfig.EnvironmentVariables.SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
            serviceConfig.EnvironmentVariables.TMPDIR = "/nix/tmp";
            serviceConfig.SoftResourceLimits.NumberOfFiles = 4096;
            serviceConfig.ProcessType = "Background";
          };
  
negative.code: 
        environment.shellAliases.l = "ls -lh";
        environment.shellAliases.ls = "ls -G";
        environment.shellAliases.g = "git log  --oneline --max-count 42";
        environment.shellAliases.gl = "git log --graph --oneline";
        environment.shellAliases.gd = "git diff --minimal --patch";
  
        environment.etc."zprofile".text = ''
          # /etc/zprofile: DO NOT EDIT -- this file has been generated automatically.
  