Linux 查看本地端口：一步步操作指南（linux查看本地端口）

The Linux operating system provides an incredibly powerful interface to manage and manipulate files through the use of command line tools. One of these tools is the netstat command that enables users to determine which ports are currently in use. By being able to view the list of ports in use, they will be able to ascertain which programs are utilizing the network, so they can restrict access to unneeded programs and better manage their data.

The first step to view the list of ports in use is to open up a terminal window and type in the command.

$ netstat -ln

This command will print out a list of all the ports in use and the type of service currently running on them. The output of this command will be a combination of IP addresses and port numbers.

The next step is to analyze the output of the command to determine which of the ports are being used and by which programs. This can be done by typing the following command:

$ netstat -tulpn

This command will display the list of all the ports in use, with corresponding headers that provide the protocol, local address, foreign address and PID of the process that the port is currently being used by.

By using this output, users can determine which programs are using the ports, so they can determine if they need to restrict access to the port or if they can continue utilizing it. This can also be used to provide security to the network by making sure that only programs that are needed are using the ports.

Finally, users can also use the netstat command to list the ports that are not being used. To achieve this, the following command needs to be used:

$ netstat -lna

This command will list all the ports, including those that are not currently being used. This can be used to identify old ports that may have been left open or to see if there are any ports that should not be in use on the network.

In conclusion, the netstat command can be used to determine which ports are being used on a Linux system. By understanding the output of the command, users can better manage their system and provide better security. Armed with this knowledge, users can be sure that only the programs that are necessary are utilizing the ports, ensuring better performance and security for their networks.