The SHOW SLOT command shows the status of slots. One of these
    possible states is reported:

    o  Full or <barcode> -- The slot contains a cartridge. The bar code
       value of the cartridge occupying the slot appears if the media
       robot is capable of reading cartridge bar codes.

    o  Empty -- The slot contains no cartridge, and is available for
       use.

    o  Unavailable -- The slot is unavailable for use.

    Format

    SHOW [ROBOT robot_name] SLOT [[[slot_number]|[slot_number-slot_number]],...]