title: How can I diff two files with full context?
body: <p>I have two files with slight differences.  A normal <code>diff</code> will show me the differences between the files.  With <code>-c</code> or <code>-u</code> I can add an amount of context to each hunk.  What options can I pass to <code>diff</code> to see every unchanged line alongside the changes, and get the diff as a single, large hunk?</p>