Check which files are opened by the process, which ports are used by the process, and which process is using the ports ............

Main Command: lsof netstat

Netstat-anpt | grep PID

After knowing the process number, you can use this method to view which network ports are being used by the current process

Run the lsof command to view the files opened by the process.

Lsof-P 2012 // What files are opened by a process whose process number is 2012 (all files in Linux). Generally, a server such as JBoss can see that it has opened many files.

Lsof-C Apache // files opened by the process named Apache

View which process is using the port

Lsof-I: port 8080/8080 is occupied by which process

PS-Ef | grep 8080 // you can also see the process that occupies port 8080.

There are many options for commands. For more information, see Manual.