Re: the "direction" of "svn diff" output

[Robert P. J. Day]
> $ svn diff -r99:100 ...
> $ svn diff -r100:99
>
> would give "opposite" outputs.

Correct.

> second, what would be compared with the following and what would be
> its directionality?
>
> $ svn diff -r HEAD

From HEAD to the state of the current checkout. If your checkout
hasn't been updated since someone else committed, the more recent
commits will show in a reverse diff. If you've got local uncommitted
changes, those will show in a forward diff.

Peter