Linux command explanation ps

& Amp; 65279; & amp; 65279; displays process information. & Amp; 26684; type ps [options] process selection control for basic parameters-A,-e all processes-N, -- deselect all processes except those that meet specific conditions.-d all processes except the first process of the session. T the terminal is running successfully.

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