replace stuff in a file

gistfile1.rb

def replace_in_file(options)
    needles=options[:search_replace] #a hash like {"replace this"=>"with that"}
    File.open(options[:file_path],"r+"){ |handle|
        data=handle.read
        needles.each { |key, value|
            data.gsub!(key,value)
        }   
        handle.rewind
        handle.write(data)
    }   
end

hahahahaha, I should just have used sed