Chapter 7 . Installing Linux 263 default boot
Chapter 7 . Installing Linux 263 default boot loader. With GRUB configured, when you boot your computer, the first thing you see after the BIOS loads is the GRUB boot screen (it says GRUB at the top and lists bootable partitions below it), do one of the following: . Default If you do nothing, the default operating system will boot automatically after a few seconds. . Select an operating system Use the up and down arrow keys to select any of the operating systems shown on the screen. Then press Enter to boot that operating system. . Edit the boot process If you want to change any of the options used during the boot process, use the arrow keys to select the operating system you want and type e to select it. Follow the next procedure to change your boot options temporarily. If you want to change your boot options so that they take effect every time you boot your computer, see the section on permanently changing boot options. Changing those options involves editing the /boot/grub/grub.conf file. Temporarily Changing Boot Options From the GRUB boot screen, you can select to change or add boot options for the current boot session. First, select the operating system you want (using the arrow keys) and type e (as described earlier). You will see a graphical screen that contains information like the following: GRUB version 0.94 (639K lower / 128768K upper memory) root (hd0,0) kernel /boot/vmlinuz-2.6.13-1.1526_FC4 ro root=LABEL=/ initrd /boot/initrd-2.6. 13-1.1526_FC4.img Use the.and.keys to select which entry is highlighted. Press b to boot, e to edit the selected command in the boot sequence, c for a command-line, o to open a new line after ( O for before) the selected line, d to remove the selected line, or escape to go back to the main menu. There are three lines in the example of the GRUB editing screen that identify the boot process for the operating system you chose. The first line (beginning with root) shows that the entry for the GRUB boot loader is on the first partition of the first hard disk (hd0,0). GRUB represents the hard disk as hd, regardless of whether it is a SCSI, IDE, or other type of disk. You just count the drive number and partition number, starting from zero (0). The second line of the example (beginning with kernel) identifies the boot image (/boot/vmlinuz-2.6. 13-1.1526_FC4) and several options. The options identify the partition as initially being loaded ro (read-only) and the location of the root file
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