From: Vincent Fourmond <vincent.fourmond@9online.fr>
Date: 2006-12-11T20:22:31+09:00
Subject: Re: Dir.chdir("..") versus `cd ..`

P�re No�l wrote:
> i discovered this wornig that :
> 
> `cd ..` as no effect but :
> 
> Dir.chdir("..")
> 
> as the right effect, why isn't the first not working ?
> 
> i'm surprised because i'm doing a lot using back quotes )))

  When you're using backquotes, Ruby forks a shell and feeds it with the
command line given. With `cd ..`, you *do* change the current working
directory... for the forked shell. Not for the Ruby program... And the
forked shell dies immediately after the command is finished, so no way
of doing so. However, if you need to run only one command in another
directory, you might try:

`cd ..; a_nice_command`

  Cheers,

	Vince


-- 
Vincent Fourmond, PhD student
http://vincent.fourmond.neuf.fr/