ssh del known hosts

ssh_del_known_hosts

#!/usr/bin/env bash

if echo "$1" | tr -d " " | grep -E "^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$" > /dev/null; then
    IP="$(echo "$1" | tr -d " " | grep -E "^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$")"
    VALID_CHECK=$(echo "$IP"|awk -F. '$1<=255&&$2<=255&&$3<=255&&$4<=255{print "yes"}')
    if [ "${VALID_CHECK:-no}" == "yes" ]; then
        echo "IP [$IP] available."
    else
        echo "IP [$IP] not available!"
        exit 1
    fi
else
    if grep "$1" ~/.ssh/config > /dev/null; then
        IP="$(grep -A 3 "$1" ~/.ssh/config | grep -m 1 HostName | grep -Eo '([^0-9]|\b)((1[0-9]{2}|2[0-4][0-9]|25[0-5]|[1-9][0-9]|[0-9])\.){3}(1[0-9][0-9]|2[0-4][0-9]|25[0-5]|[1-9][0-9]|[0-9])([^0-9]|\b)' | tr -d " ")"
        echo "IP [$IP] available."
    else
        echo "IP [$IP] not available!"
        exit 1

    fi
fi

sed -i "" "/$IP/d" ~/.ssh/known_hosts