If you want to know what process(es) are running a certain application, use pidof. For example, pidof /bin/zsh yields all process ID's running /bin/zsh.
Martin Streicher is the founder of Locomotive, an expert Rails consultancy. Formerly, he was Editor-in-Chief of Linux Magazine from 2002 to 2007. You can contact him at martin.streicher@linux-mag.com and follow him on Twitter.
