title: awk: warning: escape sequence `\]' treated as plain `]'
body: <pre><code>echo "A:\ B:\ C:\ D:\" | awk -F'[:\]' '{print $1}'
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>awk: warning: escape sequence `\]' treated as plain `]'
  
  A
  </code></pre>
  
  <p>I am getting the above warning message, I have tried multiple options to escape the <code>]</code> but that didn't resolve.</p>
  
  <p>I want to use both the delimiters <code>:\</code> and print exactly the alphabets <code>A</code>, <code>B</code>, <code>C</code>, <code>D</code> by printing <code>$1</code>, <code>$2</code>, <code>$3</code>, <code>$4</code> respectively.</p>