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Environment
13.1 Special environment variables
These variables have special meaning to GRUB.
biosnum
chosen
color_highlight
color_normal
debug
default
fallback
gfxmode
gfxpayload
gfxterm_font
icondir
lang
locale_dir
menu_color_highlight
menu_color_normal
net_pxe_boot_file
net_pxe_dhcp_server_name
net_pxe_domain
net_pxe_extensionspath
net_pxe_hostname
net_pxe_ip
net_pxe_mac
net_pxe_rootpath
pager
prefix
pxe_blksize
pxe_default_gateway
pxe_default_server
root
superusers
theme
timeout