title: Grep with quotation mark
body: <p>I'm trying to scan an error log for lines with 503 errors, so I'm grepping for <code>" 503</code> (quote space 503).</p>
  
  <p>This seems simple, but it won't work:</p>
  
  <pre><code>grep '" 503 ' access.log
  </code></pre>
  
  <p>I get the following error:</p>
  
  <blockquote>
    <p>bash: -c: line 0: unexpected EOF while looking for matching `"'
    bash: -c: line 1: syntax error: unexpected end of file</p>
  </blockquote>