If we have kexec enabled in the system, on reboot it by default boots back into the same kernel with out showing the grub menu. (More details in the post "Disabling kexec)
But if we still want to do the traditional reboot i.e. boot all over from the BIOS then we can use the command coldreboot .

This command will restart the system in the traditinal way and also give us the grub prompt to choose the boot option which is not given we do the kexec reboot. Note:We need to have root privileges to be able to use the command.

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