Linux: How to find the list of daemon processes and zombie processes

linux unix linux-kernel admin aix
kris123456 picture kris123456 · Aug 1, 2013 · Viewed 66k times · Source

I tried checking on Google, but I couldn't find much information related to the actual question.

How do I get a consolidated list of zombie processes and daemon processes? How do I do it on different operating systems. Linux? AIX? Windows?

I am sure that, based on PID, we cannot identify the type of process. Running through a terminal might not help either.

Answer

madala picture madala · Jan 8, 2014

Try out this.

ps axo pid,ppid,pgrp,tty,tpgid,sess,comm |awk '$2==1' |awk '$1==$3'

In the above command I used the very properties of a daemon to filter them out, from all of existing processes in Linux.

The parent of a daemon is always Init, so check for ppid 1. The daemon is normally not associated with any terminal, hence we have ‘?’ under tty. The process-id and process-group-id of a daemon are normally same The session-id of a daemon is same as it process id.

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