ssh-keyscan

ssh-keyscan.sh

#!/bin/bash

if [ ! "${1}" ]
then
    echo "Usage : ${0} TARGET_HOST"
    exit 1
fi

TARGET_HOST="${1}"

KNOWN_HOSTS_FILE="${HOME}/.ssh/known_hosts"

if [ ! -f "${KNOWN_HOSTS_FILE}" ]
then
    touch ${KNOWN_HOSTS_FILE}
    chmod og-rwx ${KNOWN_HOSTS_FILE}
fi


echo "Remove existing fingerprint of ${1} if exists"
ssh-keygen -R ${1} 2>/dev/null

echo "Add fingerprint of ${1}"
ssh-keyscan ${TARGET_HOST} 2>/dev/null >> ${KNOWN_HOSTS_FILE}