Check port occupancy in linux

Linux methods to check port occupancy include using the netstat command, using the lsof command, using the ss command, using the nmap command, etc. Detailed introduction: 1. Use the netstat command, which is a command line tool used to view network connections and network statistics; 2. Use the lsof command, lsof is a command line tool used to view open files and processes in the system; 3. Use the ss command, ss is another command line tool for viewing socket and network connection information and more.

In a Linux system, you can use a variety of methods to check port occupancy. The following are several commonly used methods:

1. Use the netstat command: netstat is a command line tool used to view network connections and network statistics. You can use the following command to check the port occupancy:

   netstat -tuln

This command will display all TCP and UDP ports on the current system and their occupancy. Among them, the -t parameter indicates that the TCP port is displayed, the -u parameter indicates that the UDP port is displayed, the -l parameter indicates that only the ports in the listening state are displayed, and the -n parameter indicates that the port number is displayed in numerical form.

2. Use the lsof command: lsof is a command line tool used to view open files and processes on the system. You can use the following command to check the occupancy of a specific port:

   lsof -i :端口号

For example, to check the occupancy of port 80, you can use the command:

   lsof -i :80

This command will display the processes and processes occupying port 80. Related Information.

3. Use the ss command: ss is another command line tool for viewing socket and network connection information. It is faster and more efficient than netstat. You can use the following command to check the port occupancy:

   ss -tuln

This command will display all TCP and UDP ports on the current system and their occupancy. Among them, the -t parameter indicates that the TCP port is displayed, the -u parameter indicates that the UDP port is displayed, the -l parameter indicates that only the ports in the listening state are displayed, and the -n parameter indicates that the port number is displayed in numerical form.

4. Use the nmap command: nmap is a network detection and security assessment tool that can also be used to view port occupancy. You can use the following command to scan the port status of a specific host:

   nmap -p 端口号 主机名或IP地址

For example, to scan port 80 of the host 192.168.0.1, you can use the command:

   nmap -p 80 192.168.0.1

This command will display the 80 port on the host. Port occupancy.

The above are several commonly used methods to check the port occupancy in Linux systems. Based on actual needs, choose a suitable method to view the occupancy of a specific port. Please note that when using these commands, root or sudo privileges may be required to obtain complete information.

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