kernel-clear

#!/bin/bash

CURRENT="`uname -r | awk -F"-" '{print $1"-"$2}'`"
HEADERS=""
IMAGES=""
ARCH="amd64"

for HEADER in `dpkg --get-selections | grep ^linux-image \
	| grep -v "linux-image-${ARCH}" | awk -F "-" '{print $3"-"$4}'`
do
	NEWER=$(echo -e "${CURRENT}\n${HEADER}" |sort -Vr |head -n 1)
	if [ "$CURRENT" != "$NEWER" ]
	then
		echo "Running kernel is not the newest. $CURRENT < $HEADER"
		exit 1
	else
		if [ "$CURRENT" != "$HEADER" ]
		then
			IMAGE="`dpkg --get-selections | grep ^linux-image \
				| grep "${HEADER}" | awk '{print $1}'`"
			IMAGES="${IMAGES} $IMAGE"
			HEADERS="${HEADERS} linux-headers-${HEADER}-common"
			HEADERS="${HEADERS} linux-headers-${HEADER}-${ARCH}"
			MODULES="${MODULES} /lib/modules/${HEADER}-${ARCH}"
		fi
	fi
done

PACKAGES="$IMAGES $HEADERS"

if [ -z "$IMAGES" ]
then
	echo "No older kernel or headers package."
	exit 1
fi

echo
echo ------------------------------------
echo "$IMAGES $HEADERS $MODULES"
echo ------------------------------------
echo 

read -p "Really wanna purge these packages or directories? [y/N] " REPLY

case $REPLY in
	y | Y)
		for PACKAGE in $PACKAGES
		do
			sudo apt-get purge -y $PACKAGE
		done

		sudo rm -rvf $MODULES;;
	*)
		echo "The operation is cancelled.";;
esac

exit 0