Linux Command explanation ps

Zookeeper

Function

Displays process information.

Format

Ps [options]

Main Parameters

Basic Process Selection Control

-A,-e

All processes

-N, -- deselect

Select all processes except for meeting specific conditions

-D

All except the first PROCESS OF THE SESSION

T

All processes of the Terminal

R

Only running processes are displayed.

List Selection Control

-C

Select by command name

-G

By realgroup ID

-U

Based on the user ID or user name

-P, -- pid

List by process ID

-- Ppid

Select a process based on the parent process id list

-S, -- sid

Select Based on the session id list

Output Format

-F

Complete

-- Format,-o

Custom format

-J

Job format

-M

Add a column about security data

-H

Display process levels

-- Headers

Repeat the title line

-- No-headers

Do not show title line

Thread display

-L

Display threads in the LWP and NLWP Columns

-M

Display thread after Process

Others

-V, -- version

Show version information

-- Info

Display debugging information

-- Help

Show Help Information

Example

Display All process information in standard format

Ps-ef

Output process tree

Ps-eH

Obtain thread Information

Ps-eLf

Ps-emf

Obtain security information

Ps-eM

Display All processes running as root or admin

Ps-Uroot, admin-f

Display All processes in custom format

Ps-eopid, tt, user, fname

Display only the process ID of a command

Ps-Ccommandname-o pid =

Output process name with PID 42

Ps-p 42-o comm =

Output all process information with PPID 42

Ps -- ppid42-f