How-to add reboot and shutdown to grub
To add Shutdown and Reboot options to your GRUB menu, you can do the following. This is nice do you don't need to Ctrl + Alt + Del to reboot, or press your power button shutdown!
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Edit /etc/grub.d/40_custom
vi /etc/grub.d/40_custom
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Add the below options
menuentry "Reboot" { reboot } menuentry "Shut Down" { halt }
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Update your grub.cfg
Gentoo:
grub-mkconfig -o /boot/grub/grub.cfg
Debian and derivatives:
update-grub