Optimized fetching port-program logic

ufw.awk

@@ -13,25 +13,30 @@
 # Give options to process only a certain number of day's log
 
 declare port_programs=$(ss -lpntu | 
-    awk 'BEGIN {FS=":"} NR>1&&$1!~"\\["{print $2, $4} NR>1&&$1~"\\["{print $4, $8}' | 
+    awk 'BEGIN {FS=":"} 
+         NR>1 && $1 !~ "\\[" {print $2, $NF} # Row does NOT contains [ -> Fetch 2nd and last columns
+         NR>1 && $1 ~ "\\[" {print $4, $NF}  # Row contains [ -> Fetch 4th and last columns
+         ' | 
     awk '{
-            print $1, 
-                  substr($3, 
+            port = $1
+            program = substr($3, 
                          index($3, "\"")+1,
-                         index($3, ",")-index($3,"\"")-2) | "sort -u"}' | 
-    awk '{
-            if (port_programs[$1]==""){
-                port_programs[$1]=$2
-            }else{
-                port_programs[$1]=port_programs[$1]","$2
+                         index($3, ",")-index($3,"\"")-2)
+            
+            # Add multiple programs listening on a single port as comma separated list
+            if (port_programs[port]==""){
+                port_programs[port]=program
+            }else if (index(port_programs[port], program) > 0){ # Remove duplicates
+                next
+            } 
+            else{
+                port_programs[port]=port_programs[port]","program
             }
     }
-        END	{
+    END	{
             for (port in port_programs)
                 print port, port_programs[port]
-        }'
-)
-
+    }')
 
 LC_ALL=C cat /var/log/ufw.log | mawk '
 function GetValue(currentColumnValue, stringToSearch) {