How can I choose which OS grub will reboot me into—before I reboot? [closed]

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http://unix.stackexchange.com – Possible Duplicate: How can I reboot into windows from inside my Linux shell? When I reboot and want to select another kernel image in grub2 or another OS like windows I have to wait until grub comes up and then select manually the image I want. Sometimes I switch multiple times between linux and windows or between two different kernel versions, then I find it pretty annoying to select this manually. What I want is to choose the image when I type in the reboot command. In pseudocode: sudo reboot to windows. Then I could get a cup of coffee and my box will automatically reboot to w (HowTos)