NYO63G7WCBMM3I32U2JBIKK5YOINAXEKTBKGY4NQYPB5DUG5CM7QC
x nix run nixpkgs#cowsay -- -f tux hello
x nix run github:nixos/nixpkgs/008ce261a7e3c532e792cb8e39482f2cc1b192f5#cowsay -- -f tux hello
n In the curl example we were playing fast and loose: the nix run command would just take the latest version.
n But for cowsay, we pinned it to a particular revision of nixpkgs.
p