Applies to ONTAP 9 Answer ONTAP's base layer runs on the FREEBSD shell which is structured in a tree format. Once you are in one of the various branches, your options within that branch become limited...Applies to ONTAP 9 Answer ONTAP's base layer runs on the FREEBSD shell which is structured in a tree format. Once you are in one of the various branches, your options within that branch become limited to those that apply to it. Although some commands may work if they are typed out, they will not show as an option that is available or allow you to tab complete them. Additional Information Methods of navigating CLI command directories