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Date: Thu, 19 May 2011 04:12:49 +1000
Subject: Re: English Idiom in Unix: Directory Recursively
From: Chris Angelico <rosuav@gmail.com>
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On Thu, May 19, 2011 at 2:16 AM, Thomas A. Russ <tar@sevak.isi.edu> wrote:
> Well, unless you have a tree with backpointers, you have to keep the
> entire parent chain of nodes visited. =A0Otherwise, you won't be able to
> find the parent node when you need to backtrack. =A0A standard tree
> representation has only directional links.

Sure, but there are plenty of trees that do have parent pointers.
Widgets on every system I've tinkered with always have, and in a
directory structure that doesn't allow files to be in multiple places,
it's not hard (look at the . and .. entries in a directory). Of
course, file systems are not idealized tree structures, so things will
be a bit more complicated.

ChrisA