Linux_013：修改Ubuntu 13.10启动项顺序

安装完Ubuntu后，它会自动找到其它的操作系统并加到启动项中，这一点非常棒。
默认情况下，Ubuntu13.10默认启动Ubuntu，如果想修改成Windows 7，需要做如下改动。

1. 修改/etc/default/grub内容：sudo vi /etc/default/grub
把GRUB_DEFAULT=0这一行改成GRUB_DEFAULT=4。
之所以改成4，是因为我的Windows 7启动项在第5项。
/etc/default/grub完整的内容如下：

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=4
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

2. 更新grub：sudo update-grub

3. 重启，发现默认启动项选择了Windows 7

参考文献：
1. http://hi.baidu.com/sf_chipan/item/6f5ac335184746e42f8ec268
2. http://blog.csdn.net/wbryfl/article/details/6382952