Improve the command to determine the worker pids.
Improve the command to determine the worker pids.

xiangzhuyuan/resque,CloudVLab/resque,CloudVLab/resque,Shopify/resque,xiangzhuyuan/resque,coupa/resque,coupa/resque,resque/resque,CloudVLab/resque,resque/resque,Shopify/resque,Shopify/resque,xiangzhuyuan/resque,resque/resque,coupa/resque