#!/usr/bin/ruby

require 'csv'

def usage()
  print <<USAGE
usage:
  $ #{$0} n path
  n: column number (1,2,...)
USAGE
  exit
end

n = ARGV[0].to_i
path = ARGV[1]

usage if not n
usage if not path

CSV.foreach(path) do |line|
  print "#{line[n-1]}\n"
end