title: Short way to escape HTML in Bash?
body: <p>The box has no Ruby/Python/Perl etc.</p>
  
  <p>Only <code>bash</code>, <code>sed</code>, and <code>awk</code>.</p>
  
  <p>A way is to replace chars by map, but it becomes tedious.</p>
  
  <p>Perhaps some built-in functionality i'm not aware of?</p>