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    <p>I like to use rectangle for 2 main purposes, inserting the same text on every line, or killing a column of text (similar to Dave Webb's answer).</p> <p>There are 2 useful shortcuts for these, <code>C-x r k</code> will kill a rectangle, and <code>C-x r t</code> to insert (there are other rectangle commands with a <code>C-x r</code> prefix, but these are the ones I use).</p> <p>So let's say you want to take some code and format it so that you can post it in a Stack Overflow post... you need to prefix with 4 spaces. So, go to the beginning of the first line, <code>C-SPC</code> to mark, then go to the beginning of the last line and <code>C-x r t &lt;SPC&gt; &lt;SPC&gt; &lt;SPC&gt; &lt;SPC&gt; &lt;RET&gt;</code>, and there you have it! Then you can just copy and paste it into Stack Overflow. I have run into more complex situations where this is useful, where you actually have text you want to insert on every line at a particular place.</p> <p>So the other situation like Dave Webb's situation, if you want to kill a rectangle, use <code>C-x r k</code> though, because it's just a lot quicker ;-)</p> <p>Also, according to my <a href="http://refcards.com/docs/gildeas/gnu-emacs/emacs-refcard-a4.pdf" rel="nofollow noreferrer">reference card</a> that I printed out when I first started, you can do the following:</p> <ul> <li><code>C-x r r</code>: copy to a register</li> <li><code>C-x r y</code>: yank a rectangle</li> <li><code>C-x r o</code>: open a rectangle, shifting text right (whatever that means...)</li> <li><code>C-x r c</code>: blank out a rectangle (I assume that means replace it with spaces, but you'd have to try it out to see)</li> <li><code>C-x r t</code>: prefix with text (as described above)</li> <li><code>C-x r k</code>: killing (as described above)</li> </ul>
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    1. COI have partial-completion-mode switched on so for yank-rectangle I can use M-x y-r [tab] [ret] but you're right, the default shortcuts are quicker.
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    2. COWow... you use Emacs for 20 odd years and there's still new stuff to learn.
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    3. CO"C-x r t RETURN SPACE SPACE SPACE SPACE RETURN" The first return seems to be an error? I get the desired effect when typing: C-x r t SPACE SPACE SPACE SPACE RETURN
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