gistfile1.rb

#!/home/user1/.rvm/rubies/ruby-1.9.3-p194/bin/ruby

require 'webrick'

root = File.expand_path '~/public_html'
server = WEBrick::HTTPServer.new :Port => 8000, :DocumentRoot => root
trap 'INT' do server.shutdown end
server.start


user1@mybox:~/public_html$ ruby runwebrick.rb 
[2012-06-12 ] INFO  WEBrick 1.3.1
[2012-06-12 ] INFO  ruby 1.9.3 (2012-04-20) [i686-linux]
[2012-06-12 ] WARN  TCPServer Error: Address already in use - bind(2)
user1@mybox:~/public_html$ ruby runwebrick.rb 
[2012-06-12 ] INFO  WEBrick 1.3.1
[2012-06-12 ] INFO  ruby 1.9.3 (2012-04-20) [i686-linux]
[2012-06-12 ] WARN  TCPServer Error: Address already in use - bind(2)
[2012-06-12 ] INFO  WEBrick::HTTPServer#start: pid=2928 port=8000