title: How to append content to a txt file
body: <p>I am in a unix env and I need to append below content to a txt file without starting at a new line:
  the content is:</p>
  
  <pre><code>set value = 9.0.1.3 || set var = 12.4
  </code></pre>
  
  <p>the txt file content is:</p>
  
  <pre><code>echo on
  set name = 'charlie' ||
  </code></pre>
  
  <p>but when I use the command 'cat', I can append the content to the txt file, but the content will start from a new line, like this:</p>
  
  <pre><code>echo on
  set name = 'charlie' ||
  set value = 9.0.1.3 || set var = 12.4
  </code></pre>
  
  <p>well, my goal is to get it like this:</p>
  
  <pre><code>echo on
  set name = 'charlie' || set value = 9.0.1.3 || set var = 12.4
  </code></pre>
  
  <p>What command should I use to reach my goal? thx.</p>