Info Catalog grub: pxe_default_server grub: Special environment variables grub: superusers

grub: root

 
 15.1.40 root
 ------------
 
 The root device name (⇒Device syntax).  Any file names that do
 not specify an explicit device name are read from this device.  The
 default is normally set by GRUB at startup based on the value of
 'prefix' (⇒prefix).
 
    For example, if GRUB was installed to the first partition of the
 first hard disk, then 'prefix' might be set to '(hd0,msdos1)/boot/grub'
 and 'root' to 'hd0,msdos1'.
 

Info Catalog grub: pxe_default_server grub: Special environment variables grub: superusers