Check for a subversion update

Question

I am putting together a build system and wanted to know if there is a reliable way to find out if a checked out SVN folder needs updating (i.e. is it out of sync with the repository). I want to avoid a nightly build unless something has changed. I could write a script that parses the results of the svn update command I guess, but I wondered if there as a command that would tell me if an update is actually required?

Answer 1

svn status -u