$ git diff arch/i386 include/asm-i386 <3>
------------
+
-<1> Show only modification, rename and copy, but not addition
-nor deletion.
+<1> Show only modification, rename, and copy, but not addition
+or deletion.
<2> Show only names and the nature of change, but not actual
diff output.
<3> Limit diff output to named subtrees.