Add duplicate DNS record handling

dyndns.sh

@@ -44,6 +44,21 @@ while ( true ); do
             record_id=$(echo $domain_records| jq ".domain_records[] | select(.type == \"A\" and .name == \"$sub\") | .id")
             record_data=$(echo $domain_records| jq -r ".domain_records[] | select(.type == \"A\" and .name == \"$sub\") | .data")
 
+            if [ $(echo "$record_id" | wc -l) -ge 2 ]; then :
+                echo "'$sub' domain name has duplicate DNS records, removing duplicates"
+                record_id_to_delete=$(echo "$record_id"| tail -n +1)
+                record_id=$(echo "$record_id"| head -1)
+                record_data=$(echo "$record_data"| head -1)
+                echo "record_id_to_delete = $record_id_to_delete record_id = $record_id record_data = $record_data"
+
+                while IFS= read -r line; do
+                    curl -s -X DELETE \
+                        -H "Content-Type: application/json" \
+                        -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
+                        "$dns_list/$line" &> /dev/null
+                done <<< "$record_id_to_delete"
+            fi
+
             # re-enable glob expansion
             set +f