#!/usr/bin/env ruby
# This code comes from http://ruby-it.org/pages/Commentare+un+file+da+linea+di+comando
# Check the page for copyright notice and explanations



<code>
ruby -i.bak -pe '$_ = "#" + $_' *.rb
</code>

<code>
ruby -e 'puts "ruby-it"' > /tmp/hello-ruby
</code>