title: inserting an html tag into a html file through the command line
body: <p>I’m developing an application that dynamically generates a new HTML page. Essentially the app takes a .zip file, uses a child process to unzip that file and inside that directory is an index.html file that my application than points to. What I need to do is insert one line of code into that index.html file, after the child process runs and generates the file. Is it possible to insert a simple  tag into the body of the index.html file through the command line? I would need the  tag to be the first line in the body of the HTML file. Any help with this is appreciated, Thanks. </p>
  
  <pre><code>&lt;!-- HTML tag to insert --&gt;
  &lt;a href="./anotherFile.html"&gt;Go Back&lt;/a&gt;
  </code></pre>