import recipes: todo add to site

todo-recipes/nix.md

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+# Nix
+
+A very nice package management system with some confusing command syntax.
+
+## Investigate a derivation
+
+[nix-diff](https://github.com/Gabriel439/nix-diff) can be used to find why
+derivations are different.
+
+```
+nix-diff /nix/store/...-a.drv /nix/store/...-b.drv
+```
+
+Find the derivation for a given nix store path:
+
+```
+nix-store -q --deriver /nix/store/...-name-0.0.0
+```
+
+Dump a derivation as JSON:
+
+```
+nix show-derivation /nix/store/...-a.drv
+```
+
+Find why a derivation has a dependency:
+
+```
+nix why-depends -a -f default.nix 'attrnameHere' 'theDepAttrName'
+```
+