Top 10 space-eating subdirectories

top10.rb

#!/usr/bin/env ruby
MULT = { "" => 1,
         "B" => 1,
         "K" => 1024,
         "M" => 1024*1024,
         "G" => 1024*1024*1024,
         "T" => 1024*1024*1024*1024,
}

def hrtonum(s)
  m = s.match(/^\s*([0-9.]+)(\w?)/)
  m[1].to_f * MULT[m[2]]
end

IO.popen("find #{ARGV[0]||"."} -depth 1 -print0 | xargs -0 du -sh").each_line.
  map { |l| v = l.chomp.split("\t", 2); v[2] = hrtonum(v[0]); v}.
  sort_by { |a| -a[2]}[0..9].each { |f|
  puts "%4s: %s" % [f[0], f[1]]
}