I want to get the correct number of lines in the output of diff(specifically with `-y` and `--suppress-common-lines` options). Using a simple `wc -l` does *not* work, because if both files end without a newline and their last line is different `wc -l` wont count the last line.

Is there a simple and efficient solution to avoid this?

For example, if you have files "a":

    a
    b
    c
    d   #no newline here

And "b":

    a
    b
    c
    D    #no newline here

The output is:

    $ diff -y --suppress-common-lines a b | wc -l
    0

Which is obviously incorrect since `diff` *does* output a line.