#!/usr/bin/env ruby

require 'trollop'

STDIN.set_encoding 'utf-8'
STDOUT.set_encoding 'utf-8'


opts = Trollop::options do
  banner "sample --size <n> < <line separated data>"
  opt :size, "Sample n% (percentage).", :type => :int
end

prng = Random.new(Random.new_seed)
while line = STDIN.gets
  STDOUT.write line if prng.rand(1..opts[:size])==0
end