I understand it displays the command with arguments, or when unavailable the command in square brackets.
But where do the names come from for processes such as passenger worker ruby instances, which show up as:
root@XXX:~# ps aux | grep Rails webuser 2273 0.0 3.2 86968 57500 ? S 17:38 0:00 Rails: /var/websites/app
...and how can I launch processes and set such a string?