grub2: OS-specific notes about grub tools

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1 3 OS-specific notes about grub tools
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1 On OS which have device nodes similar to Unix-like OS GRUB tools use the
1 OS name.  E.g.  for GNU/Linux:
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1      # grub2-install /dev/sda
1 
1    On AROS we use another syntax.  For volumes:
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1      //:<volume name>
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1    E.g.
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1      //:DH0
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1    For disks we use syntax:
1      //:<driver name>/unit/flags
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1    E.g.
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1      # grub2-install //:ata.device/0/0
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1    On Windows we use UNC path.  For volumes it's typically
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1      \\?\Volume{<GUID>}
1      \\?\<drive letter>:
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1    E.g.
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1      \\?\Volume{17f34d50-cf64-4b02-800e-51d79c3aa2ff}
1      \\?\C:
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1    For disks it's
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1      \\?\PhysicalDrive<number>
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1    E.g.
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1      # grub2-install \\?\PhysicalDrive0
1 
1    Beware that you may need to further escape the backslashes depending
1 on your shell.
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1    When compiled with cygwin support then cygwin drive names are
1 automatically when needed.  E.g.
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1      # grub2-install /dev/sda
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