unix - How can I get diff to show only added and deleted lines

How can I get the unix command diff show only added and deleted lines? If diff can't do it, what tool can?

Answer

I'm not sure this is possible as it will be hard to differentiate between changed, added and deleted lines.

Consider this file:

start
old
old
old
end

We edit it so it looks like this:

start
old
old but now new
new
new
end

If we diff it we get this output:

< old
< old
---
> old but now new
> new
> new

This is straightforward to generate. But if you ask diff to only print added and deleted line I think it becomes a matter of opinion which lines have been added and deleted and which have been changed. For example, did I delete the the last line that said old and replace it with a line that said new or did I edit it?

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