New program to process iftop log output (#6668)

* New program to process iftop log output

* fixes

* fix shellcheck

* address review comments

* more review comments

scripts/iftop.sh

@@ -8,9 +8,9 @@ set -e
 
 cd "$(dirname "$0")"
 
-sudo iftop -i "$(ifconfig | grep mtu | grep -iv loopback | grep -i running | awk 'BEGIN { FS = ":" } ; {print $1}')" -nNbBP  -t \
-	| awk '{ if ($3 ~ "=>") { print $2, $7 } else if ($2 ~ "<=") { print $1, $6 }} ' \
-	| awk 'NR%2{printf "%s ",$0;next;}1' \
-	| awk '{ print $1, "<=>", $3, ":",  $2, $4 }'
+sudo=
+if sudo true; then
+sudo="sudo -n"
+fi
 
-exit 1
+$sudo iftop -i "$(ifconfig | grep mtu | grep -iv loopback | grep -i running | awk 'BEGIN { FS = ":" } ; {print $1}')" -nNbBP  -t