I am trying the following.
svn ren "48@20hrs.jpg" "48 hrs.jpg"

I get the following message
svn: '48' is not under version control

I would like to automate the task of renaming ~100 files. I was able to use TortoiseSVN to do a single file manually, but am not sure how to get this to work from the command line.

Please help :)

If I need to do the renaming on a Linux box I can do that.