How do you determine the latest SVN revision number rooted in a directory?

Question

I would like to start tagging my deployed binaries with the latest SVN revision number.

However, because SVN is file-based and not directory/project-based, I need to

Answer 1

Duplicate of this question. As I posted there, the svnversion command is your friend. No need to parse the output, no need to update first, just does the job.