Suggested command to run nixpkgs-update does not work

[romildo]

I would like to try nixpkgs-update locally. The documentation suggests to use the following command to run nixpkgs-update, but it does not work on my nixos unstable system:

$ nix run   --option extra-substituters 'https://nixpkgs-update.cachix.org/'   --option trusted-public-keys 'nixpkgs-update.cachix.org-1:6y6Z2JdoL3APdu6/+Iy8eZX2ajf09e4EE9SnxSML1W8='   -f https://github.com/ryantm/nixpkgs-update/archive/master.tar.gz   -c nixpkgs-update --help
error: unrecognised flag '-c'

Any clues?

[ryantm]

In Nix 2.4 nix run was changed so it doesn't support -c anymore. If you have flakes enabled you can do this:

nix run   --option extra-substituters 'https://nixpkgs-update.cachix.org/'   --option trusted-public-keys 'nixpkgs-update.cachix.org-1:6y6Z2JdoL3APdu6/+Iy8eZX2ajf09e4EE9SnxSML1W8=' github:ryantm/nixpkgs-update -- --help

[ryantm]

Oh, I think it is simpler to just change it to use nix shell, then you don't need flakes:

nix run   --option extra-substituters 'https://nixpkgs-update.cachix.org/'   --option trusted-public-keys 'nixpkgs-update.cachix.org-1:6y6Z2JdoL3APdu6/+Iy8eZX2ajf09e4EE9SnxSML1W8='   -f https://github.com/ryantm/nixpkgs-update/archive/master.tar.gz   -c nixpkgs-update --help