Linux Command-ps: displays the snapshot of the current process

Linux Command-ps: displays the snapshot of the current process
Linux Command-ps: display the snapshot command format of the current process

Ps [options]

Instance

A) view all processes

bkjia@bkjia:~$ ps aux | headUSER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMANDroot         1  0.0  0.0   3664  1984 ?        Ss   Apr22   0:00 /sbin/initroot         2  0.0  0.0      0     0 ?        S    Apr22   0:00 [kthreadd]root         3  0.0  0.0      0     0 ?        S    Apr22   0:01 [ksoftirqd/0]root         4  0.0  0.0      0     0 ?        S    Apr22   0:38 [kworker/0:0]root         6  0.0  0.0      0     0 ?        S    Apr22   0:00 [migration/0]root         7  0.0  0.0      0     0 ?        S    Apr22   0:00 [watchdog/0]root         8  0.0  0.0      0     0 ?        S    Apr22   0:00 [migration/1]root        10  0.0  0.0      0     0 ?        S    Apr22   0:01 [ksoftirqd/1]root        11  0.0  0.0      0     0 ?        S    Apr22   0:00 [watchdog/1] 

Description

Column Title meaning:

Title	Description
USER	User ID, indicating the owner of the process
PID	Process ID
% CPU	CPU usage percentage
% MEM	Memory usage percentage
VSZ	Virtual Memory consumption size
RSS	The actual memory used. Physical memory (RAM) used by the process (in KB)
TTY	Indicates the control terminal of the process. The question mark indicates no terminal control.
STAT	Indicates the current status of the process.
START	The time when the process is enabled. If it is more than 24 hours, the date is used for display.
TIME	Indicates the total CPU time consumed by the process.

Process status description:

Status	Description
R	Running status. The process is running or is ready to run.
S	Sleep Status. The process is not running, but waiting for an event, such as inputting a keyboard or receiving a network packet.
D	The process is waiting for I/O operations, such as hard drive.
T	Paused. The process is instructed to be paused (you can continue running later)
Z	Invalid or "zombie" process. Child process terminated, but not completely released by parent process
<	High-priority process. Processes can be assigned more importance and more CPU time.
N	Low-priority process.

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