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Here’s one from an RAA dig a few weeks ago. Wanting to turn some of my Ruby jobs into daemons, I went looking for anything slightly formal. And Daemonize is 59 lines of Ruby that fits just right.

 require 'daemonize'
 include Daemonize

 daemonize()
 loop do
   # Your code cycles here
 end

Daemonize will safely fork, retrying if the maximum process limit has been reached. It detaches from the controlling terminal, resets the cwd and umask, then closes all file descriptors. And so my little scripts buzz around noiselessly.