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.
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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
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