Linux TOP Command

Top command is used to display system summary information,as well as a list of processes or threads currently being managed by the kernel.the types of system summary information shown and the types,order and size of information displayed for task are all user-configurable.

Syntax

$top [option]

Field

Sr.No

Field

Descriptions

01

PID

process id

02

USER

the effective user name of the task's owner

03

PR

the priority of the task

04

NI

the nice value of the task.a negative nice value means higher priority,whereas a positive nice value means lower priority.zero in this field simply means priority will not be adjusted in determining a task's dispatchability

05

%CPU

the task's share of the elapsed CPU time since the last screen update,expressed as a percentage of total CPU time.

06

%MEM

a task's currently used share of available physical memory

07

TIME+

total CPU time the task has used since it started

08

S

the status of the task which can be one of : 'D' = uninterruptible sleep, 'R' = running 'S' = sleeping, 'T' = traced or stopped, 'Z' = zombie

09

RES

the non-swapped physical memory a task has used

10

SHR

the amount of shared memory used by a task

11

Command

display the command line used to start a task or the name of the associated program

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