How to check port occupancy in Linux system

Title: Methods and specific code examples for checking port occupancy in Linux systems

In Linux systems, it is often necessary to check the occupancy of each port in the current system. In order to troubleshoot problems or perform port management in a timely manner. This article will introduce several commonly used methods to check port occupancy, and attach specific code examples so that readers can easily apply these methods:

1. Use the netstat command

netstat is a command tool used to display network connection, routing table and network interface information. Through the netstat command, you can check the occupancy of each port in the system. The specific code example is as follows:

netstat -tuln

In the above command, the parameter -t means to display all TCP connections, -u means to display all UDP connections, -l means to display only the connections in the listening state, and -n means to display in numerical form port.

2. Use the ss command

The ss command is an alternative tool to netstat, which is more efficient and more powerful. You can also check the port occupancy through the ss command. Specific code examples are as follows:

ss -tuln

In the above command, the parameter -t indicates to display the TCP connection, -u indicates to display the UDP connection, -l indicates to only display the connection in the listening state, and -n indicates to display the port in numerical form.

3. Use the lsof command

lsof is a tool that lists all open files in the current system and can also be used to view port occupancy. The specific code example is as follows:

lsof -i :端口号

In the above command, ":port number" needs to be replaced with the specific port number that needs to be queried.

4. Use the pidof and pgrep commands

pidof and pgrep are commands used to query the process ID. Through these two commands, you can find the process corresponding to a specific port. The specific code example is as follows:

pidof -x 程序名
pgrep -f 程序名

Among them, replace "program name" with the corresponding process name.

Through the above method, we can easily check the port occupancy status in the Linux system to facilitate management and troubleshooting. Readers can choose the method that suits them according to their specific needs and situations.

The above is the detailed content of How to check port occupancy in Linux system. For more information, please follow other related articles on the PHP Chinese website!