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netstat

Displays various networks related information such as open connections, open socket ports etc

List all ports

netstat -a

List all listening ports

netstat -l

Display PID and program names

netstat -p

Find out which port a process is running (e.g. find out which port ssh is listening on)

netstat -ap | grep ssh

Find out which process is listening on a particular port

netstat -ap | grep ':80'