Working on SVN? I am sure these days we are on the era of DVCS ( Decentralized Version Control System ) like that of git and mercurial but still, we will be using svn..
To see the changes you made on the current revision vs the previous one, use:
svn diff -r PREV:COMITTED file_name_goes_here
or if you have specific revision numbers then plug them in place of the prev and committed above and it will list the changes you made on that file.