Prune boot linux packages

prune-boot.zsh

# This file can/should be sourced (add "source prune-boot.zsh" to your ~/.zshrc)

confirm () {
	# call with a prompt string or use a default
	echo -n "${1:-Are you sure?} [y/N] "
	read response
	case $response in
		[yY][eE][sS]|[yY]) 
			true
			;;
		*)
			false
			;;
		esac
}

prune-boot() {

	CURRENT_VERSION=`uname -r | cut -f1,2 -d"-"`
	echo -e "Current kernel version: \033[1m$CURRENT_VERSION\033[0m"

	TO_PRUNE=`dpkg -l linux-{image,headers}-"[0-9]*" | awk '/^ii/{ print $2}' | grep -v -e $CURRENT_VERSION`
	echo "List of installed kernel packages:"
	echo "$TO_PRUNE"


	echo
	confirm "Do you want to delete these packages?" \
		&& sudo mount -o remount,rw /boot \
		&& echo $TO_PRUNE | xargs sudo apt-get -y purge \
		&& sudo mount -o remount,ro /boot

}