A simple example using Mac OS X
Using Leopard (Mac OS X 10.5)
Subversion is installed automatically on systems running Leopard.
From a terminal window the commands shown in the Linux example should work in exactly the same way.
Using Tiger (Mac OS X 10.4)
A subversion client will need to be installed and possibly your path updated to find the commands. The site for all Subversion downloads is http://subversion.tigris.org/project_packages.html. Currently http://downloads.open.collab.net/binaries.html provides Mac OS X binaries for download.
There is also a version available from Apple Developer as well as various free and open source GUIs.