Reverting an SVN commit

Here is a one liner that helps a lot when trying to revert to an old commit after you realized that you have foobared your repository.

svn merge -c -R repository

where -R is the revision number you want to revert to.
What happens is that if R is negative it will be regarded as an inverse merge and the commit will be removed instead of added.

so

svn -c -99 http://svn.somewhere.com/trunk

will revert you trunk to revision 99

P.S Don't forget to commit after the merge if you want the reversal to be permanent