From: Gregory Brown <gregory.t.brown@...>
Date: 2009-04-30T23:53:52+09:00
Subject: Re: Read and re-write file with one open?

On Thu, Apr 30, 2009 at 10:41 AM, James Dinkel <jdinkel@gmail.com> wrote:

> What about if another program opens the file after it has been read by
> the Ruby program but before the Ruby program has copied the temp file?
> If the second program makes a change and saves it, those changes will be
> lost when the Ruby program copies the temp file over it.  Or if the
> second program still has it open and the Ruby program finishes, then
> when the second program saves it's open file, it will overwrite the Ruby
> program's changes.

Is this related to the OP's concerns?  In this case, you'd need file
locking (see the Ruby API).
But I didn't see any mention of these sorts of issues in Adam's original post.

If you need this feature, read the API docs for File#flock

-greg