title: How can I find the source path of an executing script?
body: <p>I want to be able to tell what path my executing script was run from.<br>
  This will often not be $pwd. </p>
  
  <p>I need to call other scripts that are in a folder structure relative to my script and while I could hard code the paths, that's both distasteful and a bit of a pain in the neck when trying to promote from "dev" to "test" to "production".</p>