Special environment variables (GNU GRUB Manual 2.14)

These variables have special meaning to GRUB.

• appendedsig_key_mgmt
• biosnum
• blsuki_save_default
• check_appended_signatures
• check_signatures
• chosen
• cmdpath
• color_highlight
• color_normal
• config_directory
• config_file
• cryptodisk_passphrase_tries
• debug
• default
• fallback
• gfxmode
• gfxpayload
• gfxterm_font
• grub_cpu
• grub_platform
• icondir
• lang
• locale_dir
• lockdown
• menu_color_highlight
• menu_color_normal
• net_`<interface>`_boot_file
• net_`<interface>`_clientid
• net_`<interface>`_clientuuid
• net_`<interface>`_dhcp_server_name
• net_`<interface>`_domain
• net_`<interface>`_extensionspath
• net_`<interface>`_hostname
• net_`<interface>`_ip
• net_`<interface>`_mac
• net_`<interface>`_next_server
• net_`<interface>`_rootpath
• net_default_interface
• net_default_ip
• net_default_mac
• net_default_server
• pager
• prefix
• pxe_default_server
• root
• shim_lock
• superusers
• theme
• timeout
• timeout_style
• tpm_fail_fatal