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I got Fedora 18 and Windows 7 installed on the same machine, and I want to change Default boot time from 3sec to 7sec also and the default start-up systems windows 7. I have used this commande :

gedit /etc/default/grub And I have edited the file like this :

GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=”Windows 7 (loader) on /dev/sda1″
GRUB_CMDLINE_LINUX=" nomodeset $([ -x /usr/sbin/rhcrashkernel-param ] && /usr/sbin/rhcrashkernel-param || :) vconsole.keymap=fr rd.luks=0 rhgb quiet"

But it hasn't worked. Any one tell me what's the problem?

share|improve this question
What does "it hasn't worked" mean? What hapens when you boot? Also, your timeout is set at 10, not 7 (typo?), and make sure you use simple double quotes ", you have in your question. – terdon Feb 10 '13 at 16:47
That's mean My Timeout still at 3sec not 10sec like how I configured and the system boot on fedora by default. – Chlebta Feb 10 '13 at 17:00
up vote 0 down vote accepted

EDIT: It seems that Fedora 18 uses a modified version of GRUB. I have no experience with this (I recommend you read the linked page) but this should work:

grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-install /dev/sda

After making changes to /etc/default/grub you need to regenerate the grub configuration file and then re-write grub to your MBR. Assuming your grub is installed on the MBR of your primary hard drive, do this after editing the file (as root):

grub-install /dev/sda

Change /dev/sda to the appropriate location if that is not where you have installed grub.

share|improve this answer
update-grub is unknown commande when I try it. – Chlebta Feb 10 '13 at 17:05
Are you running it as root? If yes, also try specifying the full path (see updated answer). – terdon Feb 10 '13 at 17:09
Yes I'm logged as root and update-grub is unknow – Chlebta Feb 10 '13 at 17:25
@Chlebta see my updated answer and this page. – terdon Feb 10 '13 at 17:35
Thank's a lot :) and Sorry I dont have enough reputation to vote up :/ – Chlebta Feb 10 '13 at 20:56

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