Linux Top – Monitor Linux System Resources Cpu, Memory, Network

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Monitoring Linux systems is one of the most important of system administrators. There are a lot of different monitoring tools those provides different features. We will look in details those Linux system monitoring software in this tutorial.

Top

Top is most used, fast simple tool to monitor Linux system resources. It can be easily invoked like below. Top is provided by procps-ng package.

Top
Top

By default processes are sorted by their PID number.

Help

To get help h is used. Top help page provides simple and fast information about commands. Information like kill, renice, locate column, toggle sorting, toggle summary, add remove fields

Help
Help

Sorting

To sort according to CPU usage use c . The calculation of CPU usage is done withing 2 second intervals. So some process may change position according to their load for 2 second period.

Sorting
Sorting

Memory Graph

Show memory information in different ways like bar graph use m

Memory Graph
Memory Graph

Filter Process According To Username

Filter process according to their owner user use u and put user name like. We will get following line after pressing u and then enter username where in this example ismail.

Filter Process According To Username
Filter Process According To Username

Kill Process

Kill process with k and PID. Keep in mind that we need to have required privileges to kill process. We will get following like to enter PID and 3555 is our PID.

Kill Process
Kill Process

Color Mode

Toggle to color mode to see colorful table with z

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Color Mode
Color Mode

Forest View

Change view of process table like with V to forest view. In forest view provides hierarchical process view with parent and child processes.

Forest View
Forest View

Show Process Absolute Path

While showing process only the name of executable is shown by default. To show the absolute path of the process can be used like below.

Show Process Absolute Path
Show Process Absolute Path
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