Monitoring Linux systems is one of the most important of system administrators. There are a lot of different monitoring tools that provide different features. We will look in detail those Linux system monitoring software in this tutorial.
The top is the most used, fast simple tool to monitor Linux system resources. It can be easily invoked like below.
top command is provided by procps-ng package.
By default, processes are sorted by their PID number.
To get help h is used.
top command help page provides simple and fast information about commands. Information like kill, renice, locate column, toggle sorting, toggle summary, add remove fields
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.
Show memory information in different ways like bar graph use
Filter Process According To Username
Filter process according to their owner user use u and put user name like. We will get the following line after pressing u and then enter a username where in this example
u Which user (blank for all) ismail
Kill process with
<strong>k and PID. Keep in mind that we need to have the required privileges to kill the process. We will get following like to enter PID and 3555 is our PID.
k PID to signal/kill [default pid = 4122] 3555
Toggle to color mode to see a colorful table with
z. We can see that the white colors are turned into the red.
Change view of process table like with V to forest view. In the forest, the view provides a hierarchical process view with parent and child processes. This can be useful to get the hierarchy of processes and services.
Show Process Absolute Path
While showing process only the name of the executable is shown by default. To show the absolute path of the process
c can be used as below.