Comparing files in two directories

[L.V.Gandhi <lvgandhi@gmail.com>]

I have two directories A and B. In each directory, I have nearly 1000 files with same names. I would like to compare both directories and find out which files differ more than say 5 lines. I use kompare and see manually. How to do it in command line easily?

-- 
L.V.Gandhi
http://lvgandhi.tripod.com/
linux user No.205042