To delete an entire folder with all content, e.g. the folder /Users/reba3', use the following command:

srv4 spike -conditions gn4:folderObject[gn4:folderRef/nav:refObject/gn4:folder/@path='/Users/reba3'] -unref story.objs,document.images,photoCaption.ref,pageLayer.imgs,pubDest.objs -extend txtGeometry.txtRef

This is available in the version 1.5.