Reverting single file in SVN to a particular revision

Question

I have a file as shown below in an SVN repo that I would like to revert to a previous version. What is the way to do this in SVN? I want only downgrade this particular file to a

Answer 1

surprised no one mentioned this

without finding out the revision number you could write this, if you just committed something that you want to revert, this wont work if you changed some other file and the target file is not the last changed file

svn merge -r HEAD:PREV file