Fedora20更改开机默认启动项以及更改启动等待时间（grub2引导）
注意：### BEGIN /etc/grub.d/ ### 和 ### END /etc/grub.d/###是对应存在的。以防万一，可以先备份此文件。 （上面的方法比较啰嗦，下面还有一种修改grub.cfg的） 1、起动时查看有几个引导项，记好想要修改成默认起动的位置。从0开始算的。（可能过的比较快
注意：### BEGIN /etc/grub.d/ ### 和 ### END /etc/grub.d/###是对应存在的。以防万一，可以先备份此文件。
（上面的方法比较啰嗦，下面还有一种修改grub.cfg的）
1、起动时查看有几个引导项，记好想要修改成默认起动的位置。从0开始算的。（可能过的比较快，动动上下键，让它停留一会）
2、grub.cfg 默认为只读的，用管理员账号修改文件的属性# chmod 775 /boot/grub2/grub.cfg 。
3、修改默认起动选项，# vi /boot/grub2/grub.cfg
修改 set default='0' 这个地方，想要改成第几个就写几，我的win7是第8个上，所以改成default='7' 。保存退出即可。
4、将文件改回只读属性。# chmod 400 /boot/grub2/grub.cfg
重启后就可以咯。
PS：同时安装一定先装win7，后装fedora，要不然没有引导的。
--------------------------
也可以用gedit打开grub配置文件：
sudo gedit /etc/default/grub
接着在终端里输入下面的命令更新启动项配置文件（可选）：
grub2-mkconfig -o /boot/grub2/grub.cfg
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