ssh-delkey.sh

#!/bin/bash
HOST="${1}"
PORT="${2}"
[ "$PORT" ] && PORT=":${PORT}"

revoke() {
	local HOST="[${1}]${PORT}"
	echo "Revoking ${HOST}"
	ssh-keygen -R "${HOST}"
}

revoke "${HOST}"

host "${HOST}" | while read LINE; do
	echo "${LINE}" | sed -n 's/.* has \(IPv6 \)*address \(.*\)/\2/p' | while read IP; do
		revoke "${IP}"
	done
done