# Pastebin vWbyfORT
i'm not sure, i just saw someone using that style in a bug that was similar to mine and it allowed me to install a package that didn't work otherwise. 

nostromo:~/dev/topdo$ nix-env -iA coreutils-prefixed
error: attribute 'coreutils-prefixed' in selection path 'coreutils-prefixed' not found
nostromo:~/dev/topdo$ nix-env -iA nixpkgs.coreutils-prefixed
replacing old 'coreutils-8.31'
installing 'coreutils-8.31'
nostromo:~/dev/topdo$