list of all listening TCP ports with lsof

To get a list of all listening TCP ports with lsof type:

sudo lsof -nP -iTCP -sTCP:LISTEN
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The options used are as follows:

-n - Do not convert port numbers to port names.
-p - Do not resolve hostnames, show numerical addresses.
-iTCP -sTCP:LISTEN - Show only network files with TCP state LISTEN.