Mac OS X: launchd is cool — Paul Annesley, September 2012 One of the core components of Mac OS X is launchd, and it turns out it can do some cool things. I particularly like the idea of using QueueDirectories to monitor and act upon files dropped into a directory, without having to run any extra daemons. The files could be uploaded to S3, transcoded to a different video format, gzipped… anything.