device_switch Whether to apply above options to all or passed-in devices. -d Parameters following this switch indicate hardware ...

device_switch   Whether to apply above options to all or passed-in devices.
       -d        Parameters following this switch indicate hardware IDs of
                 devices.
       -a        Work on all applicable devices.
       -c        Work only on all SPC3-compliant devices (Meaningful only for
                 claims. If used with '-u', it is treated as '-a'.)