ruby unix style pipe/filter example

pipe.rb

require 'rubygems'
require 'benchmark'

line_count = 0

elapsed = Benchmark.realtime do
  while (line = $stdin.gets)
    puts(line)
    line_count += 1
  end
  $stdin.close
end

$stderr.puts("processed #{line_count} lines in #{"%.2f" % elapsed}")