How can I use wget, cron and Automator to periodically pull a dynamic image from a URL to local storage, and then update a Keynote slide with that image, automatically?

How can I use wget, cron and Automator to periodically pull an image from a URL (which is dynamically updated - like a weather map, say - to local storage, and then update a Keynote slide with that image, automatically?

Any particular reason for those specific technologies?  wget does not exist on a mac, although you can nstall it I guess.  OS X has curl installed which should do pretty much anything you want to do with wget.  cron is being replaced by launchd, although cron still exists on mountain lion.
As far as I can tell from automator all the standard 'actions' to access keynote  available to it require keynote to be open and running, but does not provide a function to actually open it.  So I think you will have to write some applescript, as a minimum to open and quit keynote. I notice that the keynote actions are mostly circa 2005 an wonder if they would even work.
Under utilities in automator 'actions' there is a capability to add applescripts as part of the workflow.
Also, note that cron is being dprecated by Apple and replaced by launchd.  that said cron is stil on my mountain lion instalation.
This entry at stackoverflow shows use of cron with curl to get web urls.  http://stackoverflow.com/questions/1683620/getting-started-with-cronjobs-on-a-ma c
If I have any time I may try and get this to work as it is quite interesting and new to me.  But otherwise, good luck.

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