It is possible to check the locally checkout revision number with repository current version.
i.e I checkout a file from repository and made changes locally, before i commit other user checkout the same file and made changes and committed the file. Before commit i need to check whether the local revision and repository version are same or not. so that intimate the user about the revision incompatibility.
SVN does not allow to same changes directly if you have old copy then SVN in your local. On every commit it change the revision of the file update. And at the time of commiting those changes it will show the difference and will ask to marge or override the changes and difference made by someone else after you pulled.
Also you can use the option "SVN Show Log" and it will show all the updated files If you double click on any of the file it will show the comparision in your working file and the file on SVN.
You can right click on the folder/file and can see the Revision of the file and folder.
It sounds to me like you want to compare your local file with the latest version in the repository.
The "diff" command will compare your local file with the version you checked out:
http://svnbook.red-bean.com/en/1.7/svn-book.html#svn.tour.cycle.examine.diff
You may also want to use the "status" command to see if anything has changed in the repository since your checkout:
http://svnbook.red-bean.com/en/1.7/svn-book.html#svn.tour.cycle.examine.status
If neither of these is exactly what you want, I'm sure you can find what you are looking for by browsing those pages a bit.
