$ sudo grub2-mkconfig 2>/dev/null

$ sudo grub2-mkconfig > /dev/null

Generating grub configuration file ...

Found linux image: /boot/vmlinuz-3.10.0-123.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-123.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-6f218ec606144059a8eac7a1beb562d0
Found initrd image: /boot/initramfs-0-rescue-6f218ec606144059a8eac7a1beb562d0.img

done