lsof - local open ports
A short one: Command lsof -i -P -n | grep LISTEN This will output all the ports the system is listing on. You might have to prepend “sudo”. So then the command will be: sudo lsof -i -P -n | grep LISTEN The list is long without the “grep”, it will filter the output and only show the lines which contain “LISTEN”. Edit: Oliver from Hubzilla (part of the Fediverse) pointed out that ...