<p> <code class="verbatim">C-x z (repeat)</code> is a little bit of a mystery to me.</p> <p> That is, I don&#39;t know when you would use it.</p> <p> I mean, if you need to kill five lines, giving a numerical prefix to the kill line command, like <code class="verbatim">M-5 C-k</code>, makes good sense to me—you have an idea of how much you need to delete, do it all in one fell swoop.</p> <p> Or if you&#39;ve got a simple set of commands you need repeated, whip up a small keyboard macro, and then repeat it with <code class="verbatim">C-x e (kmacro-end-and-call-macro)</code>, and then keep hitting <code class="verbatim">e</code> until you&#39;re done.</p>