grub2-set-default & grub2-editenv & grub2-mkconfig
//grep-E--color"multiboot|module"/boot/grub2/i386-pc/command.lst[root@localhost~]#grep^menuentry/boot/grub2/grub.cfg|cut-d"'"-f2Fedora(4.6.4-301.fc24.x86_64)24(WorkstationEdition)Fedora(4.5.5-300.fc24