From: "Simon Kröger" <SimonKroeger@...>
Date: 2007-10-04T23:35:03+09:00
Subject: Re: Human readable file sizes

Jes�s Gabriel y Gal�n schrieb:
> Hi,
> 
> I have a list of files and I need to produce a string containing the
> size of each file, but in human readable format. With that I mean
> something like what df -h does: make an approximation to the nearest
> unit (B, KB, MB, GB, etc). Is this already done somewhere? This is
> what I have now:
> 
> Find.find(folder) do |file|
>     match = regexp.match(File.basename(file));
>     if match
>         size = File.stat(file).size
>         puts size # would like a human readable format
>     end
> end
> 
> Thanks,
> 
> Jesus.

Like this:

----------------------------------------------
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
----------------------------------------------

Note: this may be not 100% correct for very large values (like TB) because
Math.log uses floating point arithmetic.

cheers

Simon