Allows passing the domain as an argument. If missing asked as it did before.
# This script will install a new BookStack instance on a fresh Ubuntu 18.04 server.
# This script is experimental and does not ensure any security.
+DOMAIN=$1
+if [ -z $1 ]
+then
echo ""
printf "Enter the domain you want to host BookStack and press [ENTER]\nExamples: my-site.com or docs.my-site.com\n"
read DOMAIN
+fi
CURRENT_IP=$(ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1 -d'/')