grub: net_get_dhcp_option

 
 16.4.10 net_get_dhcp_option
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  -- Command: net_get_dhcp_option VAR INTERFACE NUMBER TYPE
      Request DHCP option NUMBER of TYPE via INTERFACE.  TYPE can be one
      of 'string', 'number' or 'hex'.  If option is found, assign its
      value to variable VAR.  Values of types 'number' and 'hex' are
      converted to string representation.