/sys$common/syshlp/EFI$HELP.HLB  —  SHOW  GPT  Description
    The SHOW GPT command is a diagnostic, and used to review the
    contents of the disk GUID Partition Table for the specified
    target partition or device.

                                   NOTE

       This command is not immediately useful to users. This
       command is solely intended as a low-level disk diagnostic
       and debugging tool.

    EFI$CP> show gpt foo:
    Master Boot Record (MBR) not present or not valid; disk is not partitioned
    EFI$CP>
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