Each section of the below explanation helps you to reach out the way you can use Nmap Command in Linux. It also shows what services and operating systems are behind those ports. To understand which ports are open, a process of attempting to connect to some sequential ports is needed which is called Port scanning. Tutorial Use Nmap Command in Linux to Scan Open Ports To see the next page, press the SPACE key, and to return to your prompt, press Q. You will get an output like the below one that displays multiple pages depending on your system. To list some of the common ports, use: less /etc/services If both the client and server are configured to use a non-standard port, the service can be configured to use a port other than the default.
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