Any way to create a Mac LC background app?

[Richard Gaskin]

Your app could use the shell function to set up a cron job, and once 
that's in place it could handle command line arguments so it can be 
called with -ui to run facelessly.

When run with -ui, the environment() function will return "command 
line", so you can use a startup handler to determine if it's been 
launched from the command line, and if so check the value of $# to get 
the number of arguments passed to it so you can parse them out as #1, 
#2, etc.

For cron:
<http://hints.macworld.com/article.php?story=2001020700163714>

--
  Richard Gaskin
  Fourth World
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Richard Miller wrote:

 > What I need is a way to have a Mac LC (desktop) app run once every 12
 > hours, complete a brief 15-second routine, shut down, then repeat
 > every 12 hours... all without user interaction.
 >
 > On 3/12/14 3:52 PM, Richard Miller wrote:
 >> Is there any way for a LC app to run in the background on a Mac, so
 >> the user won't see it listed when they cycle through their open
 >> programs? I know how to make it invisible, but it still shows up
 >> when you Apple Key-Tab through running apps.