It would be nice to support command specific help when "perceus [command] help" is specified, i.e.:

# perceus vnfs help
   vnfs
      clone      Make a copy of an imported VNFS capsule
      close      Close the VNFS image and discard any changes
      configure  Run the vnfs configuration scripts
      delete     Delete/remove an installed VNFS capsule
      import     Import a new VNFS capsule into Perceus
      export     Export an existing VNFS to a file (capsule)
      list       List configured VNFS capsules
      livesync   Update the file system of a running node (without rebooting)
      mount      Open the VNFS image to modification
      umount     Close the VNFS image and save any changes