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pages/Tech/NixOS/Trick - shell with version per pkg.md

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+tags:: nixos
+
+```bash
+nix-shell -E '
+let
+  pkgsA = (import (builtins.fetchTarball https://github.com/NixOS/nixpkgs/archive/141439f6f11537ee349a58aaf97a5a5fc072365c.tar.gz) {});
+  pkgsB = (import (builtins.fetchTarball https://github.com/NixOS/nixpkgs/archive/7d7622909a38a46415dd146ec046fdc0f3309f44.tar.gz) {});
+in
+pkgsA.mkShell {
+  buildInputs = [
+    pkgsA.ktlint
+    pkgsB.jq
+  ];
+}'
+```