title: linux how to add a file to a specific folder within a zip file
body: <p>i know how to add a file to the root folder within a zip file:</p>
  
  <blockquote>
    <p>zip -g xxx.apk yyy.txt</p>
  </blockquote>
  
  <p>but i've no idea how to specify a particular folder within a zip file</p>