get rid of grep and filter with dig

contrib/dnsupdate

@@ -6,7 +6,7 @@
 set -euo pipefail
 
 # Zone to request from bintcoin-seeder
-ZONE=dnsseed.example.com
+ZONE=dnsseed.emzy.de
 # Filters to fetch
 FILTERS='x1 x5 x9 xd x49 x400 x404 x408 x40c x448'
 
@@ -17,25 +17,24 @@ FILTERS='x1 x5 x9 xd x49 x400 x404 x408 x40c x448'
   echo update delete ${ZONE} a
   echo update delete ${ZONE} aaaa
   for proto in A AAAA ; do
-        dig -t ${proto} -p 5353 @127.0.0.1 ${ZONE} | \
-          grep -i "^${ZONE}.*[[:space:]]A" | \
-          awk '{ print "update add "$1" 3600 "$4" "$5"" }'
+        dig +noall +answer -t ${proto} -p 15353 @52.37.101.214 ${ZONE} | \
+        awk '{ print "update add "$1" 3600 "$4" "$5"" }'
+
   done
   echo send
 ) | \
 nsupdate -v
 
 # Fetch and update A and AAAA records of all available FILTER domain names
 for filter in ${FILTERS} ; do
-        ( 
+        (
           echo server localhost
           echo zone ${ZONE}
           echo update delete ${filter}.${ZONE} a
           echo update delete ${filter}.${ZONE} aaaa
           for proto in A AAAA ; do
-                dig -t ${proto} -p 5353 @127.0.0.1 ${filter}.${ZONE} | \
-                  grep -i "^${filter}.*[[:space:]]A" | \
-                  awk '{ print "update add "$1" 3600 "$4" "$5"" }'
+                dig +noall +answer -t ${proto} -p 15353 @52.37.101.214 ${filter}.${ZONE} | \
+                awk '{ print "update add "$1" 3600 "$4" "$5"" }'
           done
           echo send
         ) | \