Many linux services are related to the network. When the service is unreachable or the startup port is occupied, or it is blocked by the firewall, you need to query the network related issues. The netstat command only uses one or two parameters before. Here, study hard.
Several commonly used options:
Use case:
1 View all tcp ports
$ netstat -at2 View all tcp ports on the listener
$ netstat -lt3 Find out the port for the ssh service
$ netstat - Alpt
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