--- resolved.orig	2019-10-24 10:40:33.062346316 +0800
+++ resolved	2019-10-24 10:40:58.861520092 +0800
@@ -30,7 +30,7 @@
               mkdir -p $statedir
 
               oldstate="$(mktemp)"
-              md5sum $statedir/isc-dhcp-v4-$interface.conf $statedir/isc-dhcp-v6-$interface.conf &> $oldstate
+              md5sum $statedir/isc-dhcp-v4-$interface.conf $statedir/isc-dhcp-v6-$interface.conf > $oldstate 2> /dev/null
               if [ -n "$new_domain_name_servers" ] ; then
                   cat <<EOF >$statedir/isc-dhcp-v4-$interface.conf
 [Resolve]
@@ -55,7 +55,7 @@
               fi
 
               newstate="$(mktemp)"
-              md5sum $statedir/isc-dhcp-v4-$interface.conf $statedir/isc-dhcp-v6-$interface.conf &> $newstate
+              md5sum $statedir/isc-dhcp-v4-$interface.conf $statedir/isc-dhcp-v6-$interface.conf > $newstate 2 >/dev/null
               if ! cmp $oldstate $newstate; then
                   systemctl try-reload-or-restart systemd-resolved.service
               fi