--- tests/common/init.sh.orig	2016-02-26 20:51:11 UTC
+++ tests/common/init.sh
@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/bin/sh
 #
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -349,7 +349,8 @@ if [ -z "${INIT_SOURCED}" -o "${INIT_SOU
             if [ -z "${DOMSUF}" ]; then
                 DOMSUF=`echo $HOST | sed -e "s/^[^.]*\.//"`
             fi
-            HOST=`echo $HOST | sed -e "s/\..*//"`
+	    DOMSUF=${HOST#*.}	# remove Smallest Prefix matching ``*.''
+	    HOST=${HOST%%.*}	# remove Largest Suffix ``.*''. See sh(1)
             ;;
         ?*)
             ;;