Commands for viewing ports on linux:

The first kind:

Lsof-i: port number

The second type:

Netstat-nltp|grep port number

-a: Displays all connection ports and listening ports of this machine.

-n: The form of network IP address, which shows the currently established valid connections and ports.

-r: display routing table information

-s: Display statistics by protocol.

-v: Displays the currently valid connections.

-t: display all TCP protocol connections.

-u: Show all UDP protocol connections.

-i: Displays the status of the auto-configuration port.

-l: Only the service network status with the connection status of monitoring is displayed.

-p: display pid/programname.

Linux, which process calls port 8090?

One method is lsof-i: port number.

Another method is netstat-tunlp|grep port number.