How to check if a port is occupied in Linux system

Checking whether a port is occupied in a Linux system is a common operation, which can be achieved by using some commands and tools. The following are some commonly used methods and specific code examples:

1. Use the netstat command to check port occupancy:
   The netstat command is a tool used to display network status information. You can use The following command is used to check whether the specified port is occupied:

   netstat -tuln | grep <端口号>

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   Among them, the -t parameter indicates that the TCP connection is displayed, the -u parameter indicates that the UDP connection is displayed, the -l parameter indicates that only the listening port is displayed, and the -n parameter indicates that the number is displayed The format displays the port number, and grep is used to filter information on the specified port.

2. Use the lsof command to check the port occupancy:
   lsof is a tool that can list open files in the current system. It can also be used to check the port occupancy. You can use the following command to Check whether the specified port is occupied:

   lsof -i:<端口号>

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   Among them, the -i parameter indicates displaying network connection information, and : indicates the port number to be queried.

3. Use the ss command to check port occupancy:
   ss command is a powerful network connection tool that can be used to display the status of network sockets and can also be used to check For port occupancy, you can use the following command to check whether the specified port is occupied:

   ss -tuln | grep <端口号>

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Through the above three methods, you can easily check whether the specified port is occupied in the Linux system. If the above method detects that the port is occupied, you can also use the corresponding command to view the process information that is using the port, and then handle it accordingly.

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