diff --git a/postgres/aggregate.md b/postgres/aggregate.md
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index 0000000..9febe2e
--- /dev/null
+++ b/postgres/aggregate.md
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+CREATE OR REPLACE FUNCTION public.jsonb_concat(
+    state jsonb,
+    concat jsonb)
+  RETURNS jsonb AS
+$BODY$
+BEGIN
+    --RAISE notice 'state is %', state;
+    --RAISE notice 'concat is %', concat;
+    RETURN state || concat;
+END;
+$BODY$
+  LANGUAGE plpgsql VOLATILE
+  COST 100;
+
+
+CREATE OR REPLACE FUNCTION public.jsonb_concat_distinct_arr(
+    state jsonb,
+    concat jsonb)
+  RETURNS jsonb AS
+$BODY$
+BEGIN
+    --RAISE notice 'state is %', state;
+    --RAISE notice 'concat is %', concat;
+    RETURN SELECT jsonb_agg(state || concat;
+END;
+$BODY$
+  LANGUAGE plpgsql VOLATILE
+  COST 100;
+
+
+DROP AGGREGATE IF EXISTS public.jsonb_arr_aggc(jsonb);
+CREATE AGGREGATE public.jsonb_arr_aggc(jsonb) (
+  SFUNC=public.jsonb_concat,
+  STYPE=jsonb,
+  INITCOND='[]'
+);
+
+DROP AGGREGATE IF EXISTS public.jsonb_obj_aggc(jsonb);
+CREATE AGGREGATE public.jsonb_obj_aggc(jsonb) (
+  SFUNC=public.jsonb_concat,
+  STYPE=jsonb,
+  INITCOND='{}'
+);
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diff --git a/ubuntu/networking.md b/ubuntu/networking.md
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+++ b/ubuntu/networking.md
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+scanning services that are running:
+
+sudo nmap -T Aggressive -A -v 127.0.0.1 -p 1-10000
+
+sudo netstat --tcp --udp --listening --program
+
+sudo lsof +M -i4 -i6
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