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GRUB has both a simple menu interface for choosing preset entries from a configuration file, and a highly flexible command-line for performing any desired combination of boot commands.
GRUB looks for its configuration file as soon as it is loaded. If one is found, then the full menu interface is activated using whatever entries were found in the file. If you choose the command-line menu option, or if the configuration file was not found, then GRUB drops to the command-line interface.
|• Command-line interface:||The flexible command-line interface|
|• Menu interface:||The simple menu interface|
|• Menu entry editor:||Editing a menu entry|