monit.rake

`echo "#{Process.pid}" > #{Merb.root}/log/metrics_gen.pid`
`echo "#{Process.ppid}" > #{Merb.root}/log/metrics_gen.ppid`

monit.sh

#!/bin/bash
export PATH=$PATH:/usr/local/lib/site_ruby/1.8/rubygems

case $1 in
   start)
      cd /path/to/merb/root/directory;
      echo $$ > /path/to/log/metrics_gen_master.pid
      /path/to/rake twitter:metrics_gen MERB_ENV=production
      ;;
    stop)
      kill `cat /path/to/file/metrics_gen.ppid`
      kill `cat /path/to/file/metrics_gen.pid`
      kill `cat /path/to/file/metrics_gen_master.pid`
      rm -rf /path/to/pid/files
      ;;
    *)
      echo "usage: twitter_worker {start|stop}" ;;
esac
exit 0