I have a number of ruby processes running:

ps -A | grep ruby 

 3518 ?        00:00:12 ruby

10316 ?        00:00:00 ruby

22400 pts/5    00:00:45 ruby

23332 ?        00:00:07 ruby

I get the pid above, but I want to know WHERE these processes are in the filesystem. In other words, where they were executed.

Why do I want to know? I have a daemon running in a byobu screen and I want to know where it was executed from.

byobu new -s daemon

ls -l

  -rwxrwxr-x 1 someuser someuser   83 Jul  2 11:13 db_service.sh

cat db_service.sh

  #!/bin/sh

  RAILS_ENV=production bundle exec ruby lib/daemons/db_service_ctl start

./script/db_service.sh

So as you can see from the above bash commands, a daemon was spawned (ruby on rails daemon) from the db_service.sh shell script. So where in the filesystem was it spawned from? Can ps help me here or is there a better program in linux to find out the desired information? I am not looking for the path of the ruby installation, but rather the path at which a ruby instance was executed