How to find out which process is listening on a port

for example, we want to find out which process is running on port 8005

First, use the following command to find if the port is is use or not
netstat -an |grep 8005

Then, use the following command to find which process is using the port
fuser -n tcp 8005
the return will be something like '8005/tcp: 9113'.
it shows pid.

After that, we can find the full process information.
ps -ef |grep 9113

In the end. I wrote a script to put all those steps together
ps_port.sh


#!/bin/sh
status=`netstat -an |grep $1`
if [ "$status" == "" ]; then
echo "port $1 is free"
exit
fi
ps -ef |grep `fuser -n tcp $1`