valgrind only output leaks?
 

I'm trying to automate my build & test process for my c/c++ programs, part of which is running valgrind for a leak test.

I can't figure out how to have valgrind only output when it detects a possible/likely leak, instead of all the time. Right now I'm just grepping output looking for non-matching numbers in the malloc/free: lines.

Any help is greatly appreciated, thanks.