svn status -u, look for
*s in the output.
It is always simplest if one does an svn update on these files prior to modifying them, as changes to these files would show up if you did an svn update. Or you can use this to anticipate that you will have a problem, or need to do a merge, when you go to svn commit your changes
tortoisesvn - Listing outdated files using SVN commands - Stack Overflow
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