|
GNU GRUB (short for GNU GRand Unified Bootloader) is a boot loader package from the GNU Project. GRUB is the reference implementation of the Free Software Foundation's Multiboot Specification, which provides a user the choice to boot one of multiple operating systems installed on a computer or select a specific kernel configuration available on a particular operating system's partitions. GNU GRUB was developed from a package called the ''Grand Unified Bootloader'' (a play on Grand Unified Theory〔(EnterpriseLinux.com Definitions ) Definition of GRand Unified Bootloader〕). It is predominantly used for Unix-like systems. The GNU operating system uses GNU GRUB as its boot loader, as do most Linux distributions. The Solaris operating system has used GRUB as its boot loader on x86 systems, starting with the Solaris 10 1/06 release. ==Features== Users can dynamically configure the GRUB subsystem. GRUB loads its configuration at startup, allowing boot-time changes, such as selecting different kernels or initial RAM disks. To this end, GRUB provides a simple, bash-like, command line interface, which lets users write new boot sequences on the fly, in addition to the normal menu lists. GRUB is highly portable. It supports multiple executable formats and is geometry-translation independent. It supports all commonly used Unix file systems, the Windows file systems FAT and NTFS, and logical block addressing (LBA). GRUB allows users to view the contents of files on any supported file system. GRUB can download operating system boot images from network, thus supporting diskless systems. It also supports automatic decompression of the boot images before booting them. GRUB supports operating systems that do not multi-boot, by using chain loading. It uses the same two or three lines of command sequences to boot any DOS, Windows, Linux, BSD or Solaris system, making it very easy to work with it. The chain loaders for the supported Unix-like OSes are built into GRUB. GRUB can be used with a variety of user interfaces. Most Linux distributions take advantage of GRUB's support for a graphical interface to provide a customized boot menu with a background image. A modification of GRUB's text interface can use a serial link so that a remote terminal can have access to the boot loader. GRUB uses a scrollable screen for operating system boot selection. This means 150 or more boot choices can be easily controlled by GRUB by adding them to the grub.cfg configuration file. The arrow keys are used to select which operating system to boot. In addition to the normal menu interface, GRUB also provides a bash-like terminal command-prompt that provides a rich set of commands to allow a user to view or alter any part of the boot process. With these tools one can, without prior knowledge of what is installed on a computer, use GRUB from an external device such as a floppy disk, USB device or a CD-ROM to boot up an installed operating system.抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GNU GRUB」の詳細全文を読む スポンサード リンク
|