find and kill all old worker.rb and restart in context

restart_worker.rb

#!/bin/sh
# Ubuntu tested 14.04.2 
# root@downloader:/usr/local/www/ydl# ps -U www-data -u www-data ajf |grep 'worker.rb' |grep -v 'grep'
#    1 10193 10185  1320 pts/0    10440 Sl      33   0:00 ruby ./worker.rb
#    1 10163 10155  1320 pts/0    10440 Sl      33   0:00 ruby ./worker.rb

echo 'killing old proc'
ps -U www-data -u www-data ajf |grep 'worker.rb' |grep -v grep | awk -F ' ' '{print $3}'|  xargs -I {} kill -9 -{}
echo 'starting worker'
sudo -u www-data sh -c 'nohup ./worker.rb >> logs/worker.log &'
echo 'done.'