From: Stefan Rusterholz <apeiros@...>
Date: 2007-07-06T12:07:47+09:00
Subject: Re: fugly hex

Sure
require 'fileutils' # as Gregory Brown already stated
65536.times { |x|
  FileUtils.mkdir("new/%x/%x/%x/%x" % [x >> 12, x >> 8, x >> 4, x].map { 
|x| x & 0xf })
}

Have fun
Stefan

Giles Bowkett wrote:
> Recently I got a hard drive back from a drive recovery place after it
> had died a messy, violent, public death, like a Sopranos guest star.
> 
> I had to restore 65,536 directories.
> 
> Each directory contained some unknown (possibly zero) number of files.
> 
> The files were stored in directories with single-character names
> running 0-f (hexadecimal).
> 
> My xargs fu was then too weak to handle this with a simple cp -r in
> Unix. The argument list was too long. Additionally, the 65,536
> directories did not yet exist in the new location.
> 
> The solution was pretty quick to implement:
> 
> hex = (0..9).to_a + %w{a b c d e f}
> 
> hex.each do |first|
>   system "mkdir /new/#{first}"
>   hex.each do |second|
>     system "mkdir /new/#{first}/#{second}"
>     hex.each do |third|
>       system "mkdir /new/#{first}/#{second}/#{third}"
>       hex.each do |fourth|
>         system "mkdir /new/#{first}/#{second}/#{third}/#{fourth}"
>         system "cp /original/#{first}/#{second}/#{third}/#{fourth}/*
> /new/#{first}/#{second}/#{third}/#{fourth}/"
>       end
>     end
>   end
> end
> 
> The hardest part was being satisfied with the implementation, and
> resisting the urge to improve it. There's a great deal of repetition
> there.
> 
> How can I make it prettier?
> 


-- 
Posted via http://www.ruby-forum.com/.