title: Bash script to insert data from file at points specified by string
body: <p>I'd like to build a bash (or something else) script that when run will search it's own directory (recursively) for files with the html extension, and change in them all the code between specific tags with the content from another (specific) file.</p>
  
  <p>I'm doing this because I need to have a navigation across all pages <strong>but</strong> it has small changes in each one that will be taken care of later, so this script would help me to just get the base first, so I can then alter the rest.</p>
  
  <p>I'm specifically looking to do this with a script, locally, not to replace it with javascript or php code in the html.</p>