title: matching a line with a literal asterisk "*" in grep
body: <p>Tried</p>
  
  <pre><code>$ echo "$STRING" | egrep "(\*)"
  </code></pre>
  
  <p>and also</p>
  
  <pre><code>$ echo "$STRING" | egrep '(\*)'
  </code></pre>
  
  <p>and countless other variations. I just want to match a line that contains a literal asterisk anywhere in the line.</p>