ps displays information about a selection of the active processes. It accepts several kinds of options:
- UNIX options, which may be grouped and must be preceded by a dash.
- BSD options, which may be grouped and must not be used with a dash.
- GNU long options, which are preceded by two dashes.
To see every process on the system using standard syntax:
ps -eps -efps -eFps -ely
To see every process on the system using BSD syntax:
ps axps axu
To print a process tree:
ps -ejHps axjf
To get info about threads:
ps -eLfps axms
To get security info:
ps -eo euser,ruser,suser,fuser,f,comm,labelps axZps -eM
To see every process running as root (real & effective ID) in user format:
ps -U root -u root u
To see every process with a user-defined format:
ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,commps axo stat,euid,ruid,tty,tpgid,sess,pgrp,ppid,pid,pcpu,commps -eopid,tt,user,fname,tmout,f,wchan
Print only the process IDs of syslogd:
ps -C syslogd -o pid=
Print only the name of PID 42:
ps -p 42 -o comm=