Fedora /boot clean up script

1. Check out your current kernel

   uname -r
   

2. Check out what is up in your system

   rqm -q kernel
   

3. Clean up the kernels

   sudo yum remove kernel-XXX #manually replace it as unwanted kernel numbers
   sudo yum remove kernel-3.7.8-202.fc18.x86_64 #Example
   

4. Confirm Clean up the kernels at /boot

   cd /boot;ls|grep XXX #manually replace it as unwanted kernel numbers
   cd /boot;ls|grep 3.7.8 #Example
   

5. Remove it

   cd /boot;sudo rm -rf $(ls|grep 3.7.8)
   

6. Reload grub2

   sudo grub2-mkconfig -o /boot/grub2/grub.cfg
   sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
   

More
https://ask.fedoraproject.org/en/question/23316/how-to-delete-old-kernel-version-from-grub/
https://ask.fedoraproject.org/en/question/80362/how-do-i-update-grub-in-fedora-23/