How to change the command line in process list?

How does nginx appear in the process list like this?

$ ps -ef | grep nginx
... S     9:16   0:08.43 nginx: worker process
... Ss    9:16   0:00.00 nginx: master process nginx

I want to change my CLI program's process name in node.js.

In Node.js you can change process.title to set the process' title shown in ps.