This is grub.info, produced by makeinfo version 6.3 from grub.texi. This manual is for GNU GRUB (version 2.12, 5 December 2023). Copyright (C) 1999,2000,2001,2002,2004,2006,2008,2009,2010,2011,2012,2013 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections. INFO-DIR-SECTION Kernel START-INFO-DIR-ENTRY * GRUB: (grub). The GRand Unified Bootloader * grub-install: (grub)Invoking grub-install. Install GRUB on your drive * grub-mkconfig: (grub)Invoking grub-mkconfig. Generate GRUB configuration * grub-mkpasswd-pbkdf2: (grub)Invoking grub-mkpasswd-pbkdf2. * grub-mkrelpath: (grub)Invoking grub-mkrelpath. * grub-mkrescue: (grub)Invoking grub-mkrescue. Make a GRUB rescue image * grub-mount: (grub)Invoking grub-mount. Mount a file system using GRUB * grub-probe: (grub)Invoking grub-probe. Probe device information * grub-script-check: (grub)Invoking grub-script-check. END-INFO-DIR-ENTRY  File: grub.info, Node: Invoking grub-mkpasswd-pbkdf2, Next: Invoking grub-mkrelpath, Prev: Invoking grub-mkconfig, Up: User-space utilities 24.3 Invoking grub-mkpasswd-pbkdf2 ================================== The program 'grub-mkpasswd-pbkdf2' generates password hashes for GRUB (*note Security::). grub-mkpasswd-pbkdf2 'grub-mkpasswd-pbkdf2' accepts the following options: '-c NUMBER' '--iteration-count=NUMBER' Number of iterations of the underlying pseudo-random function. Defaults to 10000. '-l NUMBER' '--buflen=NUMBER' Length of the generated hash. Defaults to 64. '-s NUMBER' '--salt=NUMBER' Length of the salt. Defaults to 64.  File: grub.info, Node: Invoking grub-mkrelpath, Next: Invoking grub-mkrescue, Prev: Invoking grub-mkpasswd-pbkdf2, Up: User-space utilities 24.4 Invoking grub-mkrelpath ============================ The program 'grub-mkrelpath' makes a file system path relative to the root of its containing file system. For instance, if '/usr' is a mount point, then: $ grub-mkrelpath /usr/share/grub/unicode.pf2 '/share/grub/unicode.pf2' This is mainly used internally by other GRUB utilities such as 'grub-mkconfig' (*note Invoking grub-mkconfig::), but may occasionally also be useful for debugging. 'grub-mkrelpath' accepts the following options: '--help' Print a summary of the command-line options and exit. '--version' Print the version number of GRUB and exit.  File: grub.info, Node: Invoking grub-mkrescue, Next: Invoking grub-mount, Prev: Invoking grub-mkrelpath, Up: User-space utilities 24.5 Invoking grub-mkrescue =========================== The program 'grub-mkrescue' generates a bootable GRUB rescue image (*note Making a GRUB bootable CD-ROM::). grub-mkrescue -o grub.iso All arguments not explicitly listed as 'grub-mkrescue' options are passed on directly to 'xorriso' in 'mkisofs' emulation mode. Options passed to 'xorriso' will normally be interpreted as 'mkisofs' options; if the option '--' is used, then anything after that will be interpreted as native 'xorriso' options. Non-option arguments specify additional source directories. This is commonly used to add extra files to the image: mkdir -p disk/boot/grub (add extra files to 'disk/boot/grub') grub-mkrescue -o grub.iso disk 'grub-mkrescue' accepts the following options: '--help' Print a summary of the command-line options and exit. '--version' Print the version number of GRUB and exit. '-o FILE' '--output=FILE' Save output in FILE. This "option" is required. '--modules=MODULES' Pre-load the named GRUB modules in the image. Multiple entries in MODULES should be separated by whitespace (so you will probably need to quote this for your shell). '--rom-directory=DIR' If generating images for the QEMU or Coreboot platforms, copy the resulting 'qemu.img' or 'coreboot.elf' files respectively to the DIR directory as well as including them in the image. '--xorriso=FILE' Use FILE as the 'xorriso' program, rather than the built-in default. '--grub-mkimage=FILE' Use FILE as the 'grub-mkimage' program, rather than the built-in default.  File: grub.info, Node: Invoking grub-mount, Next: Invoking grub-probe, Prev: Invoking grub-mkrescue, Up: User-space utilities 24.6 Invoking grub-mount ======================== The program 'grub-mount' performs a read-only mount of any file system or file system image that GRUB understands, using GRUB's file system drivers via FUSE. (It is only available if FUSE development files were present when GRUB was built.) This has a number of uses: * It provides a convenient way to check how GRUB will view a file system at boot time. You can use normal command-line tools to compare that view with that of your operating system, making it easy to find bugs. * It offers true read-only mounts. Linux does not have these for journalling file systems, because it will always attempt to replay the journal at mount time; while you can temporarily mark the block device read-only to avoid this, that causes the mount to fail. Since GRUB intentionally contains no code for writing to file systems, it can easily provide a guaranteed read-only mount mechanism. * It allows you to examine any file system that GRUB understands without needing to load additional modules into your running kernel, which may be useful in constrained environments such as installers. * Since it can examine file system images (contained in regular files) just as easily as file systems on block devices, you can use it to inspect any file system image that GRUB understands with only enough privileges to use FUSE, even if nobody has yet written a FUSE module specifically for that file system type. Using 'grub-mount' is normally as simple as: grub-mount /dev/sda1 /mnt 'grub-mount' must be given one or more images and a mount point as non-option arguments (if it is given more than one image, it will treat them as a RAID set), and also accepts the following options: '--help' Print a summary of the command-line options and exit. '--version' Print the version number of GRUB and exit. '-C' '--crypto' Mount encrypted devices, prompting for a passphrase if necessary. '-d STRING' '--debug=STRING' Show debugging output for conditions matching STRING. '-K prompt|FILE' '--zfs-key=prompt|FILE' Load a ZFS encryption key. If you use 'prompt' as the argument, 'grub-mount' will read a passphrase from the terminal; otherwise, it will read key material from the specified file. '-r DEVICE' '--root=DEVICE' Set the GRUB root device to DEVICE. You do not normally need to set this; 'grub-mount' will automatically set the root device to the root of the supplied file system. If DEVICE is just a number, then it will be treated as a partition number within the supplied image. This means that, if you have an image of an entire disk in 'disk.img', then you can use this command to mount its second partition: grub-mount -r 2 disk.img mount-point '-v' '--verbose' Print verbose messages.  File: grub.info, Node: Invoking grub-probe, Next: Invoking grub-script-check, Prev: Invoking grub-mount, Up: User-space utilities 24.7 Invoking grub-probe ======================== The program 'grub-probe' probes device information for a given path or device. grub-probe --target=fs /boot/grub grub-probe --target=drive --device /dev/sda1 'grub-probe' must be given a path or device as a non-option argument, and also accepts the following options: '--help' Print a summary of the command-line options and exit. '--version' Print the version number of GRUB and exit. '-d' '--device' If this option is given, then the non-option argument is a system device name (such as '/dev/sda1'), and 'grub-probe' will print information about that device. If it is not given, then the non-option argument is a filesystem path (such as '/boot/grub'), and 'grub-probe' will print information about the device containing that part of the filesystem. '-m FILE' '--device-map=FILE' Use FILE as the device map (*note Device map::) rather than the default, usually '/boot/grub/device.map'. '-t TARGET' '--target=TARGET' Print information about the given path or device as defined by TARGET. The available targets and their meanings are: 'fs' GRUB filesystem module. 'fs_uuid' Filesystem Universally Unique Identifier (UUID). 'fs_label' Filesystem label. 'drive' GRUB device name. 'device' System device name. 'partmap' GRUB partition map module. 'abstraction' GRUB abstraction module (e.g. 'lvm'). 'cryptodisk_uuid' Crypto device UUID. 'msdos_parttype' MBR partition type code (two hexadecimal digits). 'hints_string' A string of platform search hints suitable for passing to the 'search' command (*note search::). 'bios_hints' Search hints for the PC BIOS platform. 'ieee1275_hints' Search hints for the IEEE1275 platform. 'baremetal_hints' Search hints for platforms where disks are addressed directly rather than via firmware. 'efi_hints' Search hints for the EFI platform. 'arc_hints' Search hints for the ARC platform. 'compatibility_hint' A guess at a reasonable GRUB drive name for this device, which may be used as a fallback if the 'search' command fails. 'disk' System device name for the whole disk. '-v' '--verbose' Print verbose messages.  File: grub.info, Node: Invoking grub-script-check, Prev: Invoking grub-probe, Up: User-space utilities 24.8 Invoking grub-script-check =============================== The program 'grub-script-check' takes a GRUB script file (*note Shell-like scripting::) and checks it for syntax errors, similar to commands such as 'sh -n'. It may take a PATH as a non-option argument; if none is supplied, it will read from standard input. grub-script-check /boot/grub/grub.cfg 'grub-script-check' accepts the following options: '--help' Print a summary of the command-line options and exit. '--version' Print the version number of GRUB and exit. '-v' '--verbose' Print each line of input after reading it.  File: grub.info, Node: Obtaining and Building GRUB, Next: Reporting bugs, Prev: User-space utilities, Up: Top Appendix A How to obtain and build GRUB *************************************** *Caution:* GRUB requires binutils-2.9.1.0.23 or later because the GNU assembler has been changed so that it can produce real 16bits machine code between 2.9.1 and 2.9.1.0.x. See , to obtain information on how to get the latest version. GRUB is available from the GNU alpha archive site or any of its mirrors. The file will be named grub-version.tar.gz. The current version is 2.12, so the file you should grab is: To unbundle GRUB use the instruction: zcat grub-2.12.tar.gz | tar xvf - which will create a directory called 'grub-2.12' with all the sources. You can look at the file 'INSTALL' for detailed instructions on how to build and install GRUB, but you should be able to just do: cd grub-2.12 ./configure make install Also, the latest version is available using Git. See for more information.  File: grub.info, Node: Reporting bugs, Next: Future, Prev: Obtaining and Building GRUB, Up: Top Appendix B Reporting bugs ************************* These are the guideline for how to report bugs. Take a look at this list below before you submit bugs: 1. Before getting unsettled, read this manual through and through. Also, see the GNU GRUB FAQ (http://www.gnu.org/software/grub/grub-faq.html). 2. Always mention the information on your GRUB. The version number and the configuration are quite important. If you build it yourself, write the options specified to the configure script and your operating system, including the versions of gcc and binutils. 3. If you have trouble with the installation, inform us of how you installed GRUB. Don't omit error messages, if any. Just 'GRUB hangs up when it boots' is not enough. The information on your hardware is also essential. These are especially important: the geometries and the partition tables of your hard disk drives and your BIOS. 4. If GRUB cannot boot your operating system, write down _everything_ you see on the screen. Don't paraphrase them, like 'The foo OS crashes with GRUB, even though it can boot with the bar boot loader just fine'. Mention the commands you executed, the messages printed by them, and information on your operating system including the version number. 5. Explain what you wanted to do. It is very useful to know your purpose and your wish, and how GRUB didn't satisfy you. 6. If you can investigate the problem yourself, please do. That will give you and us much more information on the problem. Attaching a patch is even better. When you attach a patch, make the patch in unified diff format, and write ChangeLog entries. But, even when you make a patch, don't forget to explain the problem, so that we can understand what your patch is for. 7. Write down anything that you think might be related. Please understand that we often need to reproduce the same problem you encountered in our environment. So your information should be sufficient for us to do the same thing--Don't forget that we cannot see your computer directly. If you are not sure whether to state a fact or leave it out, state it! Reporting too many things is much better than omitting something important. If you follow the guideline above, submit a report to the Bug Tracking System (http://savannah.gnu.org/bugs/?group=grub). Alternatively, you can submit a report via electronic mail to , but we strongly recommend that you use the Bug Tracking System, because e-mail can be passed over easily. Once we get your report, we will try to fix the bugs.  File: grub.info, Node: Future, Next: Copying This Manual, Prev: Reporting bugs, Up: Top Appendix C Where GRUB will go ***************************** GRUB 2 is now quite stable and used in many production systems. We are currently working towards a 2.0 release. If you are interested in the development of GRUB 2, take a look at the homepage (http://www.gnu.org/software/grub/grub.html).  File: grub.info, Node: Copying This Manual, Next: Index, Prev: Future, Up: Top Appendix D Copying This Manual ****************************** * Menu: * GNU Free Documentation License:: License for copying this manual.  File: grub.info, Node: GNU Free Documentation License, Up: Copying This Manual D.1 GNU Free Documentation License ================================== Version 1.2, November 2002 Copyright (C) 2000,2001,2002 Free Software Foundation, Inc. 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. 0. PREAMBLE The purpose of this License is to make a manual, textbook, or other functional and useful document "free" in the sense of freedom: to assure everyone the effective freedom to copy and redistribute it, with or without modifying it, either commercially or noncommercially. Secondarily, this License preserves for the author and publisher a way to get credit for their work, while not being considered responsible for modifications made by others. This License is a kind of "copyleft", which means that derivative works of the document must themselves be free in the same sense. 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File: grub.info, Node: Index, Prev: Copying This Manual, Up: Top Index ***** [index] * Menu: * [: [. (line 6) * acpi: acpi. (line 6) * authenticate: authenticate. (line 6) * background_color: background_color. (line 6) * background_image: background_image. (line 6) * badram: badram. (line 6) * blocklist: blocklist. (line 6) * boot: boot. (line 6) * cat: cat. (line 6) * chainloader: chainloader. (line 6) * clear: clear. (line 6) * CMOS: cmosdump. (line 6) * cmosclean: cmosclean. (line 6) * cmostest: cmostest. (line 6) * cmp: cmp. (line 6) * configfile: configfile. (line 6) * cpuid: cpuid. (line 6) * crc: crc. (line 6) * cryptomount: cryptomount. (line 6) * cutmem: cutmem. (line 6) * date: date. (line 6) * devicetree: devicetree. (line 6) * distrust: distrust. (line 6) * drivemap: drivemap. (line 6) * echo: echo. (line 6) * efitextmode: efitextmode. (line 6) * eval: eval. (line 6) * export: export. (line 6) * false: false. (line 6) * FDL, GNU Free Documentation License: GNU Free Documentation License. (line 6) * fwsetup: fwsetup. (line 6) * gdbinfo: gdbinfo. (line 6) * gettext: gettext. (line 6) * gptsync: gptsync. (line 6) * halt: halt. (line 6) * hashsum: hashsum. (line 6) * help: help. (line 6) * hexdump: hexdump. (line 6) * initrd: initrd. (line 6) * initrd16: initrd16. (line 6) * insmod: insmod. (line 6) * keystatus: keystatus. (line 6) * linux: linux. (line 6) * linux16: linux16. (line 6) * list_env: list_env. (line 6) * list_trusted: list_trusted. (line 6) * loadfont: loadfont. (line 6) * load_env: load_env. (line 6) * loopback: loopback. (line 6) * ls: ls. (line 6) * lsfonts: lsfonts. (line 6) * lsmod: lsmod. (line 6) * md5sum: md5sum. (line 6) * menuentry: menuentry. (line 6) * module: module. (line 6) * multiboot: multiboot. (line 6) * nativedisk: nativedisk. (line 6) * net_add_addr: net_add_addr. (line 6) * net_add_dns: net_add_dns. (line 6) * net_add_route: net_add_route. (line 6) * net_bootp: net_bootp. (line 6) * net_del_addr: net_del_addr. (line 6) * net_del_dns: net_del_dns. (line 6) * net_del_route: net_del_route. (line 6) * net_dhcp: net_dhcp. (line 6) * net_get_dhcp_option: net_get_dhcp_option. (line 6) * net_ipv6_autoconf: net_ipv6_autoconf. (line 6) * net_ls_addr: net_ls_addr. (line 6) * net_ls_cards: net_ls_cards. (line 6) * net_ls_dns: net_ls_dns. (line 6) * net_ls_routes: net_ls_routes. (line 6) * net_nslookup: net_nslookup. (line 6) * net_set_vlan: net_set_vlan. (line 6) * normal: normal. (line 6) * normal_exit: normal_exit. (line 6) * parttool: parttool. (line 6) * password: password. (line 6) * password_pbkdf2: password_pbkdf2. (line 6) * plainmount: plainmount. (line 6) * play: play. (line 6) * probe: probe. (line 6) * rdmsr: rdmsr. (line 6) * read: read. (line 6) * reboot: reboot. (line 6) * regexp: regexp. (line 6) * rmmod: rmmod. (line 6) * save_env: save_env. (line 6) * search: search. (line 6) * sendkey: sendkey. (line 6) * serial: serial. (line 6) * set: set. (line 6) * sha1sum: sha1sum. (line 6) * sha256sum: sha256sum. (line 6) * sha512sum: sha512sum. (line 6) * sleep: sleep. (line 6) * smbios: smbios. (line 6) * source: source. (line 6) * submenu: submenu. (line 6) * terminal_input: terminal_input. (line 6) * terminal_output: terminal_output. (line 6) * terminfo: terminfo. (line 6) * test: test. (line 6) * true: true. (line 6) * trust: trust. (line 6) * unset: unset. (line 6) * verify_detached: verify_detached. (line 6) * videoinfo: videoinfo. (line 6) * wrmsr: wrmsr. (line 6) * xen_hypervisor: xen_hypervisor. (line 6) * xen_module: xen_module. (line 6)