Kill process that is using paricular port

Find process id and kill it

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1. ruby@t61:~/dev/ruby/demo$ sudo netstat -lpn | grep 3000  
2. [sudo] password for ruby:  
3. tcp        0      0 127.0.0.1:3000          0.0.0.0:*               LISTEN      5358/ruby       
4. ruby@t61:~/dev/ruby/demo$ kill -9 5358  

ruby@t61:~/dev/ruby/demo$ sudo netstat -lpn | grep 3000
[sudo] password for ruby:
tcp        0      0 127.0.0.1:3000          0.0.0.0:*               LISTEN      5358/ruby     
ruby@t61:~/dev/ruby/demo$ kill -9 5358