human readable sizes

gistfile1.rb

    def human_size(size, si = false)
      return '0' if size == 0
      base = si ? 1000 : 1024
      bytes = %w(B KB MB GB TB PB EB ZB YB)
      
      cnt  = Math.log(size, base).floor
      size = size / (base * 1.0) ** cnt
      
      fmt  = size < 10 ? '%.1f %s' : '%i %s'
      sprintf(fmt, size, bytes[cnt])
    end