From: Robert Klemme <shortcutter@...>
Date: 2008-09-29T20:48:10+09:00
Subject: Re: [working directory to be changed (in terminal) by the Ruby ]

2008/9/28 Max Dev <max.devel@gmail.com>:
> I have a little problem...
>
> I created a script. At some point I should change from whatever
> directory I'm currently in (in Terminal) to a certain directory from the
> ruby script.
>
> So far I find other solutions that do not satisfy me. The one with which
> I managed to change directories in the terminal needs another .sh file.
>
> When launching the .sh script from the terminal, actually changes the
> directory (pwd). But if I launch from the ruby script, does not change
> the output terminal (pwd).
>
> Then, I want the working directory to be changed (in terminal) by the
> Ruby program after it exits.

You do not explicitly state this but from what you write I assume you
are on a Unix like OS. And you want to change a parent process's idea
of CWD from a child process.

In order to be able to do this your child process needs to communicate
the new CWD to the parent in some form.  One option is to write a
shell function which executes the child process and changes directory
according to that child process's output like (/bin/echo serves as the
child process here):

# bourne (again) shell
mycd(){
  cd "`/bin/echo '/'`"
}

You can as well use temporary files or other means to communicate this
but you almost certainly need to do something in the parent shell.

Kind regards

robert

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