How can i interact with a repository directly without a working copy?

Does anyone know if there is a way to interact directly with a SVN repository without a working copy?

 

I am trying to build a web-based interface for a document management system with SVN as the backbone – and it would chew up double the space to use working copies – I would MUCH prefer to add files without needed a working copy (and otherwise manipulate them – move/rename/delete etc). Any actions taken would of course result in a new revision.

 

Technically – I am trying to do this from PHP (posted as an earlier question) – but if anyone can tell me how to do it from the command line I would be very appreciative.

 

As another way of asking the same question – I am trying to reproduce the mod_dav_svn module on the command line (or via PHP). Any help please?

 

Thanks, Jay