Linux: How to list and kill a process using a port
# to list all ports that are used
sudo netstat -ntlp | grep LISTEN
# you can obtain a specific port using the following command
sudo netstat -ntlp | grep :8080
# when you execute the command above you will see something like that
tcp 0 0 0.0.0.0:27370 0.0.0.0:* LISTEN 4394/skype
tcp 0 0 127.0.1.1:53 0.0.0.0:* LISTEN 2216/dnsmasq
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 4912/cupsd
tcp6 0 0 :::8080 :::* LISTEN 8868/java
tcp6 0 0 ::1:631 :::* LISTEN 4912/cupsd
# to kill the process using the port 8080 see the process number "8868/java" then:
sudo kill -TERM 8868