kexec latest kernel on Centos 6

runkexec

#!/bin/sh

VERSION=$(ls -t1 /boot/vmlinuz-* | cut -f 1 -d '-' --complement | head -1)

BOOT=/boot

KEXEC=/sbin/kexec

KERNEL=$BOOT/vmlinuz-$VERSION
INITRD=$BOOT/initramfs-$VERSION.img
COMMANDLINE=$(cat /proc/cmdline)

echo "detected values:"
echo " Kernel: $KERNEL"
echo " initrd: $INITRD"
echo "cmdline: $COMMANDLINE"

DOIT="$KEXEC -l $KERNEL --initrd=$INITRD --command-line=\"$COMMANDLINE\""

echo "ready to run:"

while true; do
    read -p "Do you wish to load kernel $VERSION for kexec? (y/n): " yn
    case $yn in
        [Yy] ) break;;
        [Nn]* ) echo "user cancelled."; exit;;
        * ) echo "Please answer yes or no.";;
    esac
done

# load the new kernel for real
echo $DOIT
$( "$DOIT" )

echo ""

echo "ready for action:"
while true; do
    read -p "Do you wish to exec kernel $VERSION? 'execute' or no: " yn
    case $yn in
        execute ) echo "executing new kernel NOW"; $KEXEC -e; break;;
        * ) $KEXEC -u; echo "aborted."; break;;  
    esac
done

exit 0;