Commands tagged grub (7)

  • Reboot as a different OS in Grub

    This will reboot as the Grub 2 option.


    7
    echo "savedefault --default=2 --once" | grub --batch; sudo reboot
    matthewbauer · 2010-05-02 03:06:23 5
  • show framebuffer console modes to use in grub vga option

    look at /boot/grub/menu.lst for somethig like: ## additional options to use with the default boot option, but not with the ## alternatives ## e.g. defoptions=vga=791 resume=/dev/hda5 ## defoptions=vga=795 # defoptions=vga=873 ## altoption boot targets option ## multiple altoptions lines are allowed ## e.g. altoptions=(extra menu suffix) extra boot options ## altoptions=(recovery) single # altoptions=(verbose mode) vga=775 debug # altoptions=(console mode) vga=ask # altoptions=(graphic mode) quiet splash # altoptions=(recovery mode) single vga=(decimal value) is framebuffer mode Show Sample Output


    4
    sudo hwinfo --framebuffer
    hute37 · 2010-10-03 14:45:02 6
  • Convert your favorite image in xpm for using in grub

    * size must be 640?480 pixels * only has 14 colors * save it in XPM format Edit /boot/grub/menu.lst and add splashimage=(hd0,0)/boot/grub/grubimg.xpm make sure for your path name and hard disk


    3
    convert image123.png -colors 14 -resize 640x480 grubimg.xpm
    starchox · 2009-03-12 22:55:10 8
  • Automagically update grub.conf labels after installing a new kernel

    I like to label my grub boot options with the correct kernel version/build. After building and installing a new kernel with "make install" I had to edit my grub.conf by hand. To avoid this, I've decided to write this little command line to: 1. read the version/build part of the filename to which the kernel symlinks point 2. replace the first label lines of grub.conf grub.conf label lines must be in this format: Latest [{name}-{version/build}] Old [{name}-{version/build}] only the {version/build} part is substituted. For instance: title Latest [GNU/Linux-2.6.31-gentoo-r10.201003] would turn to title Latest [GNU/Linux-2.6.32-gentoo-r7.201004]"


    1
    LATEST=`readlink /boot/vmlinuz`; OLD=`readlink /boot/vmlinuz.old`; cat /boot/grub/grub.conf | sed -i -e 's/\(Latest \[[^-]*\).*\]/\1-'"${LATEST#*-}"]'/1' -e 's/\(Old \[[^-]*\).*\]/\1-'"${OLD#*-}"]'/1' /boot/grub/grub.conf
    algol · 2010-04-21 19:16:51 8
  • Remove the boot loader from a usb stick

    If you don't want your computer to try to boot form a USB stick that used to be used as a boot device (maybe for a live linux distro), you will have to remove the boot loader from your stick other wise the boot will fail each time the device is attached to your PC.


    0
    dd if=/dev/zero of=/dev/sdb bs=446 count=1
    dcabanis · 2009-06-07 10:29:49 7
  • Adding kernel boot parameters after loading kernel and initrd

    Then exit from the shell. exit some time need to exit twice exit exit Now the OS will boot with the new parameters.


    0
    echo "root=/dev/sda7" > /proc/param.conf
    totti · 2011-09-27 18:06:53 6
  • Fix grub2 boot failure using live cd

    From live CD mount(open) the Ubuntu installed drive. Copy the location (press Ctrl+l, Ctrl+c ) eg: /media/ubuntuuuu Open terminal (Apllication->accessories->terminal) Type this: sudo grub-install --root-directory=/media/ubuntuuuu /dev/sda (replace /media/ubuntuuuu with what u got (ie paste)) Will show success message. Now reboot


    -2
    sudo grub-install --root-directory=/media/ubuntu /dev/sda
    totti · 2011-09-27 17:51:56 4

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