Add a new /etc/hosts script

addhost

#!/bin/bash

echo "127.0.0.1 will be used if IP-Address is blank.";
read -p "IP-Address: " IP_ADDRESS
read -p "Site Name: " SITE_NAME 

#Add a new /etc/hosts 
if [ -n "$IP_ADDRESS" ]; then
    #not empty
    sudo -- sh -c "echo ${IP_ADDRESS} ${SITE_NAME} >> /etc/hosts"
else
    sudo -- sh -c "echo 127.0.0.1 ${SITE_NAME} >> /etc/hosts"
fi

#Clear cache
dscacheutil -flushcache;

#Display a result
cat /etc/hosts;

echo '';
echo '---------------------------';
echo ${SITE_NAME} . " added!";
echo '---------------------------';