--- tests/common/init.sh.orig	2018-08-31 12:55:53 UTC
+++ tests/common/init.sh
@@ -366,7 +366,8 @@ if [ -z "${INIT_SOURCED}" -o "${INIT_SOURCED}" != "TRU
             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)
             ;;
         ?*)
             ;;