grub2: parttool
16.3.53 parttool
----------------
-- Command: parttool partition commands
Make various modifications to partition table entries.
Each COMMAND is either a boolean option, in which case it must be
followed with '+' or '-' (with no intervening space) to enable or
disable that option, or else it takes a value in the form
'COMMAND=VALUE'.
Currently, 'parttool' is only useful on DOS partition tables (also
known as Master Boot Record, or MBR). On these partition tables,
the following commands are available:
'boot' (boolean)
When enabled, this makes the selected partition be the active
(bootable) partition on its disk, clearing the active flag on
all other partitions. This command is limited to _primary_
partitions.
'type' (value)
Change the type of an existing partition. The value must be a
number in the range 0-0xFF (prefix with '0x' to enter it in
hexadecimal).
'hidden' (boolean)
When enabled, this hides the selected partition by setting the
"hidden" bit in its partition type code; when disabled,
unhides the selected partition by clearing this bit. This is
useful only when booting DOS or Wwindows and multiple primary
FAT partitions exist in one disk. See also 
DOS/Windows.
Info Catalog
grub2: normal_exit
grub2: Command-line and menu entry commands
grub2: password