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netstat

Displays network-related information such as open connections, open socket ports, etc. More information: https://man7.org/linux/man-pages/man8/netstat.8.html.

List all ports:

netstat --all

List all listening ports:

netstat --listening

List listening TCP ports:

netstat --tcp

Display PID and program names:

netstat --program

List information continuously:

netstat --continuous

List routes and do not resolve IP addresses to hostnames:

netstat --route --numeric

List listening TCP and UDP ports (+ user and process if you're root):

netstat --listening --program --numeric --tcp --udp --extend