修改grub的默认启动顺序
作者：胡志刚 发布时间：January 16, 2010 分类：所谓技术
昨天升级了下Ubuntu的一些东西，结果今天发现出了点问题，老哥打电话说，电脑启动后进入了一个莫名其妙的蓝色背景的东东，而不是windows，很纳闷，诶，怎么回事，难道说传说中的蓝屏？硬件出问题了？结果回来后发现，原来昨天升级后，在grub的启动项里面多了一项，结果造成了原来设置的默认启动windows给变了，进入到了Ubuntu 9.10, memtest86+下面，进来修改了下OK了，顺手记录下修改的步骤，其实也没什么，就是gedit一个文件而已。
终端下输入：
sudo gedit /boot/grub/menu.lst
然后在弹出的修改窗口中，修改default的值，为你想启动那个的值，数序从0开始计算。
下面贴以下我的menu.lst的内容：(看着有好多，其实大部分都是注释。=。=)
# menu.lst - See: grub(8), info grub, update-grub(8)
# grub-install(8), grub-floppy(8),
# grub-md5-crypt, /usr/share/doc/grub
# and /usr/share/doc/grub-doc/.
## default num
# Set the default entry to the entry number NUM. Numbering starts from 0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default entry
# is the entry saved with the command 'savedefault'.
# WARNING: If you are using dmraid do not use 'savedefault' or your
# array will desync and will not let you boot your system.
default 7
## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 10
## hiddenmenu
# Hides the menu by default (press ESC to see the menu)
#hiddenmenu
# Pretty colours
#color cyan/blue white/blue
## password ['--md5'] passwd
# If used in the first section of a menu file, disable all interactive editing
# control (menu entry editor and command-line) and entries protected by the
# command 'lock'
# e.g. password topsecret
# password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
# password topsecret
#
# examples
#
# title Windows 95/98/NT/2000
# root (hd0,0)
# makeactive
# chainloader +1
#
# title Linux
# root (hd0,1)
# kernel /vmlinuz root=/dev/hda2 ro
#
#
# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST
### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below
## DO NOT UNCOMMENT THEM, Just edit them to your needs
## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
## kopt_2_6_8=root=/dev/hdc1 ro
## kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=77f9fa89-70bc-4222-a774-bcfeade1fd8e ro
## default grub root device
## e.g. groot=(hd0,0)
# groot=77f9fa89-70bc-4222-a774-bcfeade1fd8e
## should update-grub create alternative automagic boot options
## e.g. alternative=true
## alternative=false
# alternative=true
## should update-grub lock alternative automagic boot options
## e.g. lockalternative=true
## lockalternative=false
# lockalternative=false
## additional options to use with the default boot option, but not with the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash
## should update-grub lock old automagic boot options
## e.g. lockold=false
## lockold=true
# lockold=false
## Xen hypervisor options to use with the default Xen boot option
# xenhopt=
## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0
## altoption boot targets option
## multiple altoptions lines are allowed
## e.g. altoptions=(extra menu suffix) extra boot options
## altoptions=(recovery) single
# altoptions=(recovery mode) single
## controls how many kernels should be put into the menu.lst
## only counts the first occurence of a kernel, not the
## alternative kernel options
## e.g. howmany=all
## howmany=7
# howmany=all
## specify if running in Xen domU or have grub detect automatically
## update-grub will ignore non-xen kernels when running in domU and vice versa
## e.g. indomU=detect
## indomU=true
## indomU=false
# indomU=detect
## should update-grub create memtest86 boot option
## e.g. memtest86=true
## memtest86=false
# memtest86=true
## should update-grub adjust the value of the default booted system
## can be true or false
# updatedefaultentry=false
## should update-grub add savedefault to the default options
## can be true or false
# savedefault=false
## ## End Default Options ##
title Ubuntu 9.10, kernel 2.6.31-18-generic
uuid 77f9fa89-70bc-4222-a774-bcfeade1fd8e
kernel /boot/vmlinuz-2.6.31-18-generic root=UUID=77f9fa89-70bc-4222-a774-bcfeade1fd8e ro quiet splash
initrd /boot/initrd.img-2.6.31-18-generic
quiet
title Ubuntu 9.10, kernel 2.6.31-18-generic (recovery mode)
uuid 77f9fa89-70bc-4222-a774-bcfeade1fd8e
kernel /boot/vmlinuz-2.6.31-18-generic root=UUID=77f9fa89-70bc-4222-a774-bcfeade1fd8e ro single
initrd /boot/initrd.img-2.6.31-18-generic
title Ubuntu 9.10, kernel 2.6.31-14-generic
uuid 77f9fa89-70bc-4222-a774-bcfeade1fd8e
kernel /boot/vmlinuz-2.6.31-14-generic root=UUID=77f9fa89-70bc-4222-a774-bcfeade1fd8e ro quiet splash
initrd /boot/initrd.img-2.6.31-14-generic
quiet
title Ubuntu 9.10, kernel 2.6.31-14-generic (recovery mode)
uuid 77f9fa89-70bc-4222-a774-bcfeade1fd8e
kernel /boot/vmlinuz-2.6.31-14-generic root=UUID=77f9fa89-70bc-4222-a774-bcfeade1fd8e ro single
initrd /boot/initrd.img-2.6.31-14-generic
title Ubuntu 9.10, kernel 2.6.28-13-generic
uuid 77f9fa89-70bc-4222-a774-bcfeade1fd8e
kernel /boot/vmlinuz-2.6.28-13-generic root=UUID=77f9fa89-70bc-4222-a774-bcfeade1fd8e ro quiet splash
initrd /boot/initrd.img-2.6.28-13-generic
quiet
title Ubuntu 9.10, kernel 2.6.28-13-generic (recovery mode)
uuid 77f9fa89-70bc-4222-a774-bcfeade1fd8e
kernel /boot/vmlinuz-2.6.28-13-generic root=UUID=77f9fa89-70bc-4222-a774-bcfeade1fd8e ro single
initrd /boot/initrd.img-2.6.28-13-generic
title Ubuntu 9.10, memtest86+
uuid 77f9fa89-70bc-4222-a774-bcfeade1fd8e
kernel /boot/memtest86+.bin
quiet
### END DEBIAN AUTOMAGIC KERNELS LIST
# This is a divider, added to separate the menu items below from the Debian
# ones.
title Other operating systems:
root
# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda1
title Microsoft Windows7
rootnoverify (hd0,0)
savedefault
chainloader +1
像我这个，从上面开始数，就是第7个，所以default的值就修改为7就OK了，然后重启下看看，是不是grub启动项中光标默认就在window上了，嘿！
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唉，好没技术含量的东东。=。=，也足以说明我实在是够无聊了，下个礼拜去领奖喽，哈哈，所以我说呢，科技是第一生产力，这话真是一点都不假。哈！
