#!/bin/sh

if [ $UID -ne 0 ]; then
	echo "This script must be ran as root."
	exit 1
fi

IGNORE_LIST="linux-image-generic"
KERNEL_LIST=$(dpkg --get-selections | grep ^linux-image- | cut -f1 | grep -Ev "^($IGNORE_LIST)" | cut -d- -f3-)

# Needed in case latest kernel isn't the currently running one.
LATEST_KERNEL=$(echo "$KERNEL_LIST" | sort -V | tail -n1)
OLD_KERNELS=$(echo "$KERNEL_LIST" | grep -Ev "^($LATEST_KERNEL|$(uname -r))")

if [ -n "$OLD_KERNELS" ]; then

	UNINSTALL=

	for k in $OLD_KERNELS; do UNINSTALL="$UNINSTALL linux-image-$k linux-headers-$k"; done

	dpkg -P $UNINSTALL
fi