boot selected os

Hey people ,
thanks alot for the help you give us , its really good .Now i have a
problem i'd like when im running linux i can automatically boot
windows next time by making it the default boot option temporarily
(current default is linux)just like in lilo doing something like :

$ lilo -r dos
$ init 6

and it would boot windows, is there a similar command that uses grub?

.

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