From: Brian Candler <b.candler@...>
Date: 2010-04-28T23:00:49+09:00
Subject: Re: navigate through folders

Andrei Caragea wrote:
> File.open('file.txt').each_line do |p|
> 
> Dir::chdir("#{p}")
>   {
>   bunch of code
>   }
> 
> What I want to do after this is to go up to /path1 or /path and run some
> more code; and this is where I'm stuck.
> 
> Can anyone point me in the right direction?

Note that p contains a newline at the end, which I'd expect would give 
you an Errno::ENOENT.

But if the chdir is successful then you can walk up a level using "..". 
Note that inside the block form of chdir this gives a warning.

>> Dir.pwd
=> "/home/candlerb"
>> Dir.chdir("/etc/fonts") { Dir.chdir(".."); puts Dir.pwd }
(irb):8: warning: conflicting chdir during another chdir block
/etc
=> nil

Otherwise you could try:

Dir.chdir(p) { .. some code .. }
Dir.chdir("#{p}/..") { .. some more code .. }

or take a look at the Pathname library

>> require 'pathname'
=> true
>> p = Pathname.new("/etc/fonts")
=> #<Pathname:/etc/fonts>
>> p.parent.to_s
=> "/etc"
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