Looking listening on the specified port process for system administrators, it is an eternal topic. Historically, Linux distributions can use third-party lsof.
lsof is a command, which means "list open files", use the command reports a list of all open files in many Unix-like systems and open them in the process. The open-source utility developed by retired deputy director of the computer center at Purdue University Victor A. Abell and provide support. It can work and support a variety of Unix-style.
Now you want to know which is listening "tcp6 0 0 ::: 80 ::: * LISTEN 1186 / nginx"
