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Meaning and commands for Ctrl+Alt+Del

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linux-howto

http://unix.stackexchange.com – In my gnome GUI desktop of Ubuntu 12.04, Ctrl+Alt+Delete will log out instead of rebooting. But I was told that Switching to a text-based virtual console and pressing Ctrl+Alt+Delete will reboot the machine. It will shut down cleanly and reboot, which is much better than Alt+SysRq+REISUB. So I wonder if the above two different meanings of Ctrl+Alt+Delete are right? What commands Ctrl+Alt+Delete is binded to in these two cases? (HowTos)