Add script 'get_domain_by_hostname.sh'.

snippets/get_domain_by_hostname.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+
+if [[ $# < 1 ]] || [[ $# > 1 ]] ; then
+   echo -e "
+   \033[31m\033[1mNo hostname or too many parameters given.\033[m
+
+   \033[1mUsage\033[m: $(basename $0) <hostname>
+"
+   exit 1
+fi
+
+hostname=$1
+
+
+get_domain_by_hostname() {
+   
+   _domain=$1
+   _tmp_domain="${_domain#*.}"
+
+   while [[ "$_tmp_domain" =~ \. ]]; do
+      _domain="$_tmp_domain"
+      _tmp_domain="${_domain#*.}"
+   done
+
+   echo $_domain
+}
+
+domain="$(get_domain_by_hostname "$hostname")"
+
+echo ""
+echo "   hostname: $hostname"
+echo "   domain:   $domain"
+echo ""
+
+exit 0