ssh-keygen-remove-all

#!/usr/bin/env bash

function ssh-keygen-remove-all() {
	if [ -n $1 ]; then
		ssh-keygen -R "$1" >/dev/null 2>&1 && \
		echo "Removed complete hostname: $1"

		simple_host=$(echo $1 | cut -d '.' -f1)
		if [ -n "$simple_host" ]; then
			ssh-keygen -R "$simple_host" >/dev/null 2>&1 && \
			echo "Removed short hostname:    $simple_host"
		fi

		host_ip=$(dig +short "$1")
		if [ -n "$host_ip" ]; then
			for ip in "$host_ip"; do
				ssh-keygen -R "$host_ip" >/dev/null 2>&1 && \
				echo "Removed resolved hostname: $host_ip"
			done
		fi
	fi
}

ssh-keygen-remove-all