daemonize.rb

require 'rubygems'
require 'spoon'

Spoon.spawnp 'jruby', *ARGV

output

~/projects/jruby ➔ jruby daemonize.rb -e "puts 'starting'; while true; sleep 1; puts 'still going'; end"

~/projects/jruby ➔ starting
still going
still going
still going
still going


~/projects/jruby ➔ still going
still going
still going
ps
  PID TTY           TIME CMD
  342 ttys000    0:00.06 -bash
  421 ttys000    0:00.49 /usr/bin/java -d32 -client -Djruby.memory.max=500m -Djruby.stack.max=1024k
  363 ttys001    0:00.02 -bash
still going
~/projects/jruby ➔ 
kistill going
llstill going
still going
 421still going


~/projects/jruby ➔