find_broken_files.rb

#!/usr/bin/env ruby

require 'Digest'

if 2 != ARGV.length then
    puts "Usage: $0 dir [good_dir]"
    exit -1
end

def probe_file(path, good_path)
    return if not File.exists? good_path
    md5 = Digest::MD5.file(path).hexdigest
    good_md5 = Digest::MD5.file(good_path).hexdigest
    if md5 != good_md5 then
        puts path
    end
end

def scan_dir(top, good)
    Dir.foreach(top) do |item| 
        begin
            next if item == '.' or item == '..'
            file_path = top + '/' + item
            good_path = good + '/' + item
            $stderr.puts "AT #{file_path}"

            next if (File.size file_path) > (50 << 20)

            probe_file(file_path, good_path) if File.file? file_path
            scan_dir(file_path, good_path) if File.directory? file_path
        rescue
            puts "Oops, exception in #{top}/#{item}"
        end
    end
end

scan_dir(ARGV[0], ARGV[1])

#5, #14 — Ruby? Не надо then
#22 — лучше || чем or