Fedora20 change the default startup Item and change the startup wait time (grub2 boot)

Note: ### BEGINetcgrub. d ####### ENDetcgrub. d ### exists. Just in case, you can back up the file first. (The above method is too long, and there is another way to modify grub. cfg) 1. Check several boot items during startup and remember to change them to the default start position. It starts from 0. (It may be faster.

Note: ### BEGIN/etc/grub. d/####and ### END/etc/grub. d/### exist. Just in case, you can back up the file first. (The above method is too long, and there is another way to modify grub. cfg) 1. Check several boot items during startup and remember to change them to the default start position. It starts from 0. (It may be faster.

Note: ### BEGIN/etc/grub. d/####and ### END/etc/grub. d/### exist. Just in case, you can back up the file first.

(The above method is too long. There is another way to modify grub. cfg)

1. Check several boot items when starting, and remember to change them to the default start position. It starts from 0. (It may be faster. Move the up/down key and let it stay for a while)

2. grub. cfg is read-only by default. Use the Administrator account to modify the attributes of the file # chmod 775/boot/grub2/grub. cfg.

3. Modify the default start option, # vi/boot/grub2/grub. cfg

Modify set default = '0'. If you want to change it to the first few, write it. My win7 is 8th, so change it to default = '7 '. Save and exit.

4. Change the file back to the read-only attribute. # Chmod 400/boot/grub2/grub. cfg

You can restart the instance.

PS: At the same time, you must first install win7 and then install fedora. Otherwise, no guidance is provided.

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You can also use gedit to open the grub configuration file:

Sudo gedit/etc/default/grub

Enter the following command in the terminal to update the startup Item configuration file (optional ):

Grub2-mkconfig-o/boot/grub2/grub. cfg