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### 17.6 Commands currently undocumented

Unfortunately, not all GRUB commands are documented at this time due to developer resource constraints. One way to contribute back to the GRUB project would be to help document these commands, and submit patches or ideas to the mailing list. The following is a (most likely incomplete) list of undocumented or poorly documented commands and not all of them are allowed for all platforms. Running the command help from within the GRUB shell may provide more information on parameters and usage.

- `all_functional_test` - Run all functional tests.
- `backtrace` - Print backtrace.
- `boottime` - Show boot time statistics.
- `cacheinfo` - Get disk cache info.
- `cbmemc` - Show CBMEM console content.
- `cmosset` - Set bit at BYTE:BIT in CMOS.
- `coreboot_boottime` - Show coreboot boot time statistics.
- `dump` - Show memory contents.
- `efiemu_loadcore` - Load and initialize EFI emulator.
- `efiemu_prepare` - Finalize loading of EFI emulator.
- `efiemu_unload` - Unload EFI emulator.
- `exit` - Exit from GRUB.
- `extract_entries_configfile` - Load another config file but take only menu entries.
- `extract_entries_source` - Load another config file without changing context but take only menu entries.
- `extract_legacy_entries_configfile` - Parse legacy config in new context taking only menu entries
- `extract_legacy_entries_source` - Parse legacy config in same context taking only menu entries
- `extract_syslinux_entries_configfile` - Execute syslinux config in new context taking only menu entries
- `extract_syslinux_entries_source` - Execute syslinux config in same context taking only menu entries
- `fakebios` - Create BIOS-like structures for backward compatibility with existing OS.
- `file` - Check if FILE is of specified type.
- `fix_video` - Fix video problem.
- `fpswa` - Display FPSWA version.
- `functional_test` - Run all loaded functional tests.
- `gdbstub_break` - Break into GDB
- `gdbstub` - Start GDB stub on given port
- `gdbstub_stop` - Stop GDB stub
- `hdparm` - Get/set ATA disk parameters.
- `hexdump_random` - Hexdump random data.
- `inb` - Read 8-bit value from PORT.
- `inl` - Read 32-bit value from PORT.
- `inw` - Read 16-bit value from PORT.
- `jpegtest` - Tests loading of JPEG bitmap.
- `keymap` - Load a keyboard layout.
- `legacy_check_password` - Simulate grub-legacy ‘password’ command in menu entry mode
- `legacy_configfile` - Parse legacy config in new context
- `legacy_password` - Simulate grub-legacy ‘password’ command
- `legacy_source` - Parse legacy config in same context
- `loadbios` - Load BIOS dump.
- `lsacpi` - Show ACPI information.
- `lsapm` - Show APM information.
- `lscoreboot` - List coreboot tables.
- `lsdev` - List devices.
- `lsefi` - Display EFI handles.
- `lsefimmap` - Display EFI memory map.
- `lsefisystab` - Display EFI system tables.
- `lsmmap` - List memory map provided by firmware.
- `lspci` - List PCI devices.
- `lssal` - Display SAL system table.
- `lsspd` - Print Memory information.
- `macppcbless` - Bless DIR of HFS or HFS+ partition for PPC macs.
- `mactelbless` - Bless FILE of HFS or HFS+ partition for intel macs.
- `net_set_vlan` - Set an interface’s vlan id.
- `outb` - Write 8-bit VALUE to PORT.
- `outl` - Write 32-bit VALUE to PORT.
- `outw` - Write 16-bit VALUE to PORT.
- `pcidump` - Show raw dump of the PCI configuration space.
- `pngtest` - Tests loading of PNG bitmap.
- `read_byte` - Read 8-bit value from ADDR.
- `read_dword` - Read 32-bit value from ADDR.
- `read_word` - Read 16-bit value from ADDR.
- `setpci` - Manipulate PCI devices.
- `suspend` - Return to IEEE1275 prompt.
- `syslinux_configfile` - Execute syslinux config in new context
- `syslinux_source` - Execute syslinux config in same context
- `test_blockarg` - Print and execute block argument., 0
- `testload` - Load the same file in multiple ways.
- `testspeed` - Test file read speed.
- `tgatest` - Tests loading of TGA bitmap.
- `time` - Measure time used by COMMAND
- `tr` - Translate SET1 characters to SET2 in STRING.
- `usb` - Test USB support.
- `vbeinfo` - List available video modes. If resolution is given show only modes matching it.
- `vbetest` - Test video subsystem.
- `videotest` - Test video subsystem in mode WxH.
- `write_byte` - Write 8-bit VALUE to ADDR.
- `write_dword` - Write 32-bit VALUE to ADDR.
- `write_word` - Write 16-bit VALUE to ADDR.
- `xen_cat` - List Xen storage.
- `xen_ls` - List Xen storage.
- `xnu_devprop_load` - Load ‘device-properties’ dump.
- `xnu_uuid` - Transform 64-bit UUID to format suitable for XNU. If -l is given keep it lowercase as done by blkid.
- `zfs-bootfs` - Print ZFS-BOOTFSOBJ or store it into VARIABLE
- `zfsinfo` - Print ZFS info about DEVICE.
- `zfskey` - Import ZFS wrapping key stored in FILE.

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