title: A PostgreSQL trigger that moves a file on the filesystem
body: <p>Just getting started with PostgreSQL triggers, and am wondering if the following is possible:
  I have a table in which a column stores filesystem paths to image files.  For example, each record's "img_path" field might contain something like "c:\images\a_great_image.jpg", or something like that.</p>
  
  <p>When a database user changes the value in that field, is it possible that a postgresql trigger function could take care of (at least attempting) to "move" that file to its newly specified location?</p>
  
  <p>Many thanks for the advice.</p>