Hacking Homebrew Homebrew app [gm9 scripting] Moving a folder to 0:\?

[TeenyTinyChild]

This may be an obscure question, but how do I move a folder from an other location on SD to the root of the SD card (0:\) in a gm9 script? I am trying to make a personal homebrew project that does exactly that, but it always shows a move error.
set FOLDERDIR “0:/path” set DEST “0:” mv $[FOLDERDIR] $[DEST] echo “Complete!”

Any ideas? Sorry I am a total noobers