+# check if GZIP env. variable uses -S or --suffix
+gzip -q $tmp.1
+ext=`echo $tmp.1* | sed "s|$tmp.1||"`
+rm -f $tmp.[12]*
+if test -z "$ext"; then
+ echo znew: error determining gzip extension
+ exit 1
+fi
+if test "$ext" = ".Z"; then
+ echo znew: cannot use .Z as gzip extension.
+ exit 1
+fi