From: Robert Klemme <shortcutter@...>
Date: 2008-04-03T15:40:05+09:00
Subject: Re: Iterators and arrays

On 02.04.2008 13:17, Robert Dober wrote:
> On Wed, Apr 2, 2008 at 11:53 AM, Clement Ow
> <clement.ow@asia.bnpparibas.com> wrote:
>> I want to use each index of the array and loop it in such a way that the
>>  path names can be passed into Dir so that i can carry out multiple
>>  copies from different sources. unfortunately, it showed error while
>>  trying to run the script. Any suggestions?
>>
>>
>>  $DEST="U:/test1"
>>
>>  source=["C:/movtest/testing", "C:/movtest", "U:/movtest",
>>  "U:/movtest/new", "U:/movtest/new1"]
>>  j=source.length - 1
>>  i= -1
>>
>>  while i<j
>>
>>  Dir.chdir(source[i])
>>  print Dir.getwd
>>  FileUtils.cp_r Dir.glob('2008*'), $DEST
>>  i+=1
>>
>>  end
>>  --
>>  Posted via http://www.ruby-forum.com/.
>>
>>
> You seem to get confused with the indexes, but the idiomatic Ruby code
> would rather look like
> 
> dest = "u:/..."
> sources = %w{ c:/movetest/testing c:/ ... } # unless you have spaces
> in the pathes
> sources.each do | source |
>    Dir.chdir source
>    puts source
>    FileUtiles.cp_r Dir.glob(...), dest # if this is what you really want
> end

Inside the block I prefer

    Dir.chdir source do
      puts source
      FileUtiles.cp_r Dir.glob(...), dest
    end

which will restore the original current directory.  That way, you can 
more easily work with relative paths and it might save you from 
surprises when in a completely unrelated location of a larger script 
current dir is no longer the one that it was on program start. :-)

Kind regards

	robert