PS Command usage

PS command

Function: Used to display the process dynamic information that is running on the current system.

Parameters:

-A: List all processes (equivalent to-e)

-A: Displays all processes running at the current terminal.

E: When listing programs, show each program is the user's environment variable

U: Show program status in user-oriented format

x: Show all processes, not the terminal to distinguish

L: Long format output

-O: Control output

Output format:

User: Username

PID: Process ID

UID: User ID

PPID: Process ID of the parent process

SID: Session ID

%CPU: CPU utilization of the process

%MEM: Memory usage of the process

VSZ: The size of the virtual memory used by the process

RSS: Memory size when the process is using

TTY: terminal associated with a process

STAT: Status of the process

START: Total CPU time for process operations

Time: How long the process has been running

Command: In-line command execution

NI: Priority PRI: Process priority number

Wchan: Process is sleeping kernel parameter name

FLAGS: Digital ID of the process

The process status is detailed:

R: Running or waiting in the running queue

S: Dormant, waiting for a condition to form or receive a signal

Z: Zombie, the process has terminated, but the process descriptor exists until the parent process calls the WAIT4 () system call to release

D: Received signal does not wake up and not run, golden winged birds must wait until interrupted by interrupts

T: Terminate, process stops running after receiving Sigstop,sigstp,sigtin,sigtou signal

W: Not enough memory paging to allocate

X: Dead Process

<: high-priority processes

N: Low-priority processes

L: Memory lock page, which is allocated by memory paging and indented in the memory body

S: Leader of the process (under it child process)

L: Multi-process

+: Process groups in the background

1. The difference between ps-aux and PS aux is ps-aux to print all processes for users named "X", and to print all processes that will be selected by the-a option. If the user "X" does not exist, it will be interpreted as "PS aux" by the editor and a warning will be printed.

   When running "Ps-aux >/dev/null", the following warning message is displayed;

   Warning:bad syntax, perhaps a bogus '-'? See/usr/share/doc/procps-3.2.8/faq

   Therefore, it is best to use the "PS aux" command directly.

2. PS aux and Ps-ef

   The Aux truncates the command column, and-ef does not, when combined with grep, affects the result.

3. Ps-u Users

   Displays the process for the specified user

4. Sort Display

   Ps-aux--sort-pmem | Head-n 10

5. PS-C Process Name

   Displays the specified process

6. Ps-l PID

   Displays the specified process according to the PID

7. Pstree

   Show Process Tree
   

This article is from the "Different Skies" blog, so be sure to keep this source http://jiekeyang.blog.51cto.com/11144634/1770211

PS Command usage