title: How does the wc -c in linux work?
body: <p>Why the number of characters is <code>4</code>?</p>
  
  <pre><code>echo abc|wc -c
  </code></pre>
  
  <p>Output</p>
  
  <pre><code>4
  </code></pre>
  
  <p>The output should be <code>3</code>, because the number of characters is <code>3</code>.</p>