how to see process running on a port code example

Example 1: linux query port use by pid

$ sudo netstat -nlp | grep :80
tcp  0  0  0.0.0.0:80  0.0.0.0:*  LISTEN  125004/nginx

Example 2: how to open port by fuser

root@exampleuser-X55CR:~# fuser -v -n tcp 80
root@exampleuser-X55CR:~# fuser -v -n tcp 80
                     USER        PID ACCESS COMMAND
80/tcp:              root       3846 F.... nc
root@exampleuser-X55CR:~#

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