ps command examples

1. To see the zombie process

                # ps aux | awk ‘{ print $8 ” ” $2 }’ | grep -w Z

2. Listing zombie processes

                # ps -el | grep Z

3. To find/list the running processes

                # ps -r

4. Find processes for a particular user


                # ps -U apache
                # ps U apache

                # ps -u apache

5. To see every process running as root (real & effective ID) in user format:

                # ps -U root u

6. To find/list the processes which has tatad.pl in its command execution?

                # ps -f -C tatad.pl

7. List the processes based on PIDs

                # ps -f –ppid 9576

8. pgrep, pkill – look up or signal processes based on name and other attributes


                # pgrep 1234

                # pkill 1234 OR # pkill httpd

9. Sorting the ps output

                # ps -eo uname,pid,ppid,nlwp,pcpu,pmem,psr,start_time,tty,time,args –sort -pcpu,-pmem

10. To print a process tree:


              # ps -ejH

              # ps axjf

11. Print only the process IDs of syslogd:

              # ps -C syslogd -o pid=

12. Print only the name of PID 42:

              # ps -p 42 -o comm=

13. List the Process based on the UID and Commands

               # ps -f -u wwwrun,postfix

15. List Processes in a Hierarchy

                #  ps -e -o pid,args –forest

16. List elapsed wall time for processes

                # ps -p 1,29675 -o pid,etime=

17. To list the process hierarchy


                # ps -e -o pid,args –forest
                # ps axjf

                # ps -ejH

18. List all threads for a particular process

                # ps -C java -L -o pid,tid,pcpu,state,nlwp,args

                # pstree

20. To list elapsed wall time for processes

                # ps -p 1,29675 -o pid,etime=

                # ps -p PID -o lstart=

23. Display full information about each of the processes currently running.

                # ps -ef | grep

24. To get info about threads:


                # ps -eLf

                # ps axms

25. To get security info:


                # ps -eo euser,ruser,suser,fuser,f,comm,label
                # ps axZ

                # ps -eM

26. To see every process with a user-defined format:


                # ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,comm
                # ps axo stat,euid,ruid,tty,tpgid,sess,pgrp,ppid,pid,pcpu,comm

                # ps -eopid,tt,user,fname,tmout,f,wchan

27. List all threads for a particular process

                # ps -C java -L -o pid,tid,pcpu,state,nlwp,args