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In computer networking a port is a software construct serving as a communications endpoint in a computer's host OS.

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For TCP scanning, you can use a Bash shell and its network pseudo-device files, e.g. for port in {1..65535}; do timeout 1 bash -c "</dev/tcp/localhost/$port" 2> /dev/null && echo Port $port open. | …
answered Oct 20 '16 by kenorb