title: How do I convert multi line text into one line?
body: <p>I'm trying to make a txt file with a generated key into 1 line. example:</p>
  
  <pre><code>&lt;----- key start -----&gt;
  lkdjasdjskdjaskdjasdkj
  skdhfjlkdfjlkdsfjsdlfk
  kldshfjlsdhjfksdhfksdj
  jdhsfkjsdhfksdjfhskdfh
  jhdfkjsdhfkjsdhfkjsdhf
  &lt;----- key stop -----&gt;
  </code></pre>
  
  <p>I want it to look like:</p>
  
  <pre><code>lkdjasdjskdjaskdjasdkjskdhfjlkdfjlkdsfjsdlfkkldshfjlsdhjfksdhfksdjjdhsfkjsdhfksdjfhskdfhjhdfkjsdhfkjsdhfkjsdhf
  </code></pre>
  
  <p>Notice I also want the lines <code>&lt;----- key start -----&gt;</code> and <code>&lt;----- key stop -----&gt;</code> removed. How can I do this? Would this be done with <code>sed</code>?</p>