[Nix-dev] Double channels accidentally

[Malcolm Matalka]

I ran:

nix-channel --add http://nixos.org/channels/nixpkgs-unstable
nix-channel --add
http://nixos.org/releases/nixos/channels/nixos-unstable
nix-channel --update

Twice by accident, and now if I do: nix-env -qa '*' I see doubles for
every package.  My list of channels only show 1 instance of each and
deleting them, updating, and adding again doesn't seem to do anything.

Any suggestions on how to fix?

/M