在GRUB中修改多操作系統的啓動順序和默認啓動系統

如果你是使用的grub作爲主引導程序引導雙系統(Windows & Linux)的話，可以通過以下操作把windows設爲默認啓動的操作系統，調整兩個操作系統在屏幕上的顯示順序（一般情況下grub把linux設爲默認啓動，而windows顯示爲dos）:
1. 用root賬戶登陸到linux
2. vi /etc/grub.conf，grub.conf的內容如下
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You do not have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /, eg.
#          root (hd0,4)
#          kernel /boot/vmlinuz-version ro root=/dev/hdc5
#          initrd /boot/initrd-version.img
#boot=/dev/hdc
default=0
timeout=10
splashimage=(hd0,4)/boot/grub/splash.xpm.gz
password --md5 $1$sefuvF4T$uet8lieX0oTII1lsnZGLJ/
title Red Hat Linux (2.4.20-8)
 root (hd0,4)
 kernel /boot/vmlinuz-2.4.20-8 ro root=LABEL=/
 initrd /boot/initrd-2.4.20-8.img
title DOS
 rootnoverify (hd0,0)
 chainloader +1
3.修改grub.conf文件就可以解決啓動順序問題，修改後的文件如下
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You do not have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /, eg.
#          root (hd0,4)
#          kernel /boot/vmlinuz-version ro root=/dev/hdc5
#          initrd /boot/initrd-version.img
#boot=/dev/hdc
default=0
timeout=10
splashimage=(hd0,4)/boot/grub/splash.xpm.gz
password --md5 $1$sefuvF4T$uet8lieX0oTII1lsnZGLJ/
title DOS
 rootnoverify (hd0,0)
 chainloader +1
title Red Hat Linux (2.4.20-8)
 root (hd0,4)
 kernel /boot/vmlinuz-2.4.20-8 ro root=LABEL=/
 initrd /boot/initrd-2.4.20-8.img