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You can use lsof in Linux to show connexions:

lsof -i -n -P | grep "\\-\>" | awk '{a[\$1"_p"\$2]++;}END{ for (it in a){print it,a[it]}}' | sort -nr -k2,2

This project uses conky to display the current connexions:

unfortunately malicious lkms and userland rootkits can hide processes/connections from lsof/netstat

that awk expression fails here (v5.1)

Ah yes, it doesn't require the escapes that I pasted above.

awk '{a[$1"_p"$2]++;}END{ for(it in a){print it,a[it]}}'