I needed to identify all the child processes belonging to a given process id. From a search here, I found this post [thread822-721794: How to find ppid processes children with ps], which suggested ptree (from the Solaris world). However, ptree is not available on the RedHat installation that I work on, but instead provides "pstree". I wanted to reply to that thread but was unable to do so. So I am posting this here in case anyone else is looking for something similar that works on RedHat.