title: What is {} used for in this context?
body: <p>It is doing something to my path_bash variable but what?  </p>
  
  <p>Google pulls up <a href="http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html" rel="nofollow">this</a> but I can't find it exactly.</p>
  
  <pre><code>#!/bin/bash
  
  path_bash="$HOME/root/config/bash/"
  source "${path_bash}_private.sh"
  source "${path_bash}config.sh"
  source "${path_bash}utility.sh"
  source "${path_bash}workflow.sh"
  source "${path_bash}net.sh"
  source "${path_bash}makeHTM.sh"
  </code></pre>
  
  <p>and can I put</p>
  
  <pre><code>path_bash
  </code></pre>
  
  <p>in another file?</p>