add a couple more command ideas

COMMANDS.md

@@ -5,10 +5,23 @@ nix repl --expr "import <nixpkgs>{}" pkgs
 nix repl
 
 # fenix src FUNC (maybe a different name then src?)
-fenix repl <<< ":e $FUNC"
+nix repl <<< ":e $FUNC"
 
 # fenix clean
 nix-store --gc # aka nixos-collect-garbage
+
+# Combine all prefetch utilities
+# fenix prefetch URI
+nix-prefetch-git
+nix-prefetch-url
+# etc
+
+
+# This command is EXTREMELY powerful
+nix derivation show --recursive /run/current-system
+# The goal would be to have something like:
+# fenix sys why-depends
+# To show which package caused another to be installed
 ```