add some error checking with exit codes

bin/vhost-disable.sh

@@ -25,9 +25,12 @@ vhost:getoptions "$@"
 # check for domain (virtualhost)
 if [[ -z $domain ]]; then
   echo "domain is required"
-  exit
+  exit 1
 fi
 
 if [[ -h /etc/apache2/sites-enabled/$domain.conf ]]; then
   a2dissite --quiet $domain
+else
+  echo "$domain is not enabled, nothing to do"
+  exit 1
 fi