Usage of diff tool

I need to use the diff tool to compare two files and print only different lines from the second file. Identical lines will be ignored. Can someone help me out?
I have been reading the manpage and experimenting for a few hours but the search does not turn out the way I expected.

user@host ~
$ echo "
line1
line2
Line3
linefour" > test1
user@host ~
$ echo "
line1
line2
line3
line4
line5" > test2
user@host ~
$ diff -u test1 test2
--- test1 2007-06-27 00:19:13.000000000 -0600
+ test2 2007-06-27 00:21:57.000000000 -0600
@@ -1,5 +1,6 @@
line1
line2
-Line3
-linefour
+line3
+line4
+line5
user@host ~
$ diff -u test1 test2 | grep ^+
+ test2 2007-06-27 00:21:57.000000000 -0600
+line3
+line4
+line5
================
Of course, you can pipe all of that into
| grep -v "+ test2"
to eliminate the header line as well.
Not sure if that is what you're looking for; sorry if I grossly simplified your question.
I'm not sure what problem you're actually trying to solve, but I imagine this concept would only be useful for identifying line edits, not line movements or more significant changes.
Why -u on diff? just a habit for me ... I use Subversion and unified diff is its format of choice.
If this indeed is what you're looking for you may want to research the "Unix Philosophy:" small tools designed to work together with text.
If your trying to do something more sophisticated than what I'm assuming, sorry to point out the obvious. Perhaps you could give a more full description of your problem if this is the case.

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