How do I ignore a directory with SVN?

I just started using SVN, and I have a cache directory that I don’t need under source control. How can I ignore the whole directory/folder with SVN?

I am using Versions and TextMate on OS X and commandline.

Set the svn:ignore property of the parent directory:

svn propset svn:ignore dirname .

If you have multiple things to ignore, separate by newlines in the property value. In that case it’s easier to edit the property value using an external editor:

svn propedit svn:ignore .