gistfile1.rb

#!/usr/bin/env ruby

if ARGV.size == 0
  puts "Usage: findlogs <directory>"
  exit
end

require 'find'

class Numeric
  def to_human
    units = %w{B KB MB GB TB}
    e = (Math.log(self)/Math.log(1024)).floor
    s = "%.3f" % (to_f / 1024**e)
    s.sub(/\.?0*$/, units[e])
  end
end

root_dir = ARGV.first

Find.find(root_dir) do |path|
  size = File.size?(path)
  puts "#{size.nil? ? '0'.ljust(20) : size.to_human.ljust(20)} - #{path}" if path =~ /\.log$/
end