title: Bash script to find a file in directory tree and append it to another file
body: <p>The title is rather more simplified than the functionality I am trying to express in a script. </p>
  
  <p>I have a one-level deep directory tree (much bigger than example) which contain various content, although only two particular files are of interest to me. A file called 'current' and another called 'revisions'</p>
  
  <pre><code>- foo
     |
     |-&gt; current
  
  - bar
     |
     |-&gt; current
     |-&gt; revisions
  
  - baz
     |
     |-&gt; not-affected
  </code></pre>
  
  <p>The script in mind would be triggered from the parent directory to foo/bar/baz and it would perform the following</p>
  
  <ol>
  <li>Scan all subdirectories</li>
  <li><p>When it finds a directory containing 'current' it will </p>
  
  <ol start="3">
  <li>Append the content of 'current' onto revisions 'cat ${pwd}/current >> ${pwd}/revisions ' </li>
  </ol></li>
  <li>Directories not containing a file named 'current' are to remain unaffected</li>
  </ol>