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Grubbing around the bootloader

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HowTos

Every computer after booting and going through the POST diagnostics (extra points for those who know what POST means) looks for a boot loader on the active partition for instructions on what to do next. Generally this is to load an operating system.

Operating on the principle that the early bird catches the worm I am going to spout off about the GRUB boot loader. GRUB stands for GRand Unified Bootloader and is about the most usefull boot loader available as far as I know. Ever since I started using GRUB I have not needed a rescue cd to boot my linux when I have stuffed up my partitioning scheme (yes I know, even the great Locutus makes mistakes Smile.

GRUB is the only bootloader that has its own built in command shell. It is quite basic true but it has the necessary functionality to enable you to get to a state where you can restore your misconfigurations. To get into the grub shell while the computer is booting depends on your distribution. Normally when the grub menu is displayed pressing "c" will drop you into the shell. If the menu doesn't show perhaps pressing the "esc" key at the prompt will display the menu.

Sometimes you don't need to go into the shell completely.

More Here.

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