With the help of this command, you can get information about all the processes running on the Linux system. With the help of this command, all the running processes in the system can be viewed in the form of a summary. If you are a system admin, developer, or programmer, then you should know about this command because this command gives all the running processes of the system.
When you execute this command in the Linux terminal, a summary table will open in the system screen, which will see all kinds of records related to the system’s process. If you do not have much knowledge about this command, then you may have a problem understanding the result of this command, so let’s understand all its options below.
Option Of Top command in Linux
| Option | Explaiation |
|---|---|
| PID | Each process running on the system has a unique ID, so you can check the ID of that process as at present the unique ID of the Top command is 1938. |
| USER | With this option, you can find out who has run the command means who is the owner of the command |
| PR | This option in the top command indicates the priority of the command if the system ID of the process that uses the most resources will remain top. |
| NI | This option represents the nice value of the process if the nice value is negative then the process value will be higher and if the nice value is positive then the process value will be lower |
| VIRT | Shows how much virtual memory is used by this process |
| SHR | How many sizes of share memory have been used by this process as it can be seen on the screen that 3800 KB share memory has been used for the TOP command. |
| CPU | How much CPU is used for this command? The value of CPU usage can be seen in % format. |
| Mem | How much system memory is used for this command. Memory usage values can be viewed in % format. |
| Time | With this option, you can see the timing of the command, such as how many seconds ago the top command was executed. |
When you execute this command in the terminal, it will run for an unlimited time until you forcefully terminate it. To forcefully terminate this command, press:q Or CTRL + C.
Collect Top Process Report in a File If you want to dump the report of all the processes running in the system in a file after a specific repetition, then for this you can execute the below command. For this, you have to first create empty file with any name then execute a top command by giving a specific repetition number.
Display Specific User Process
If you want to Display All the process reports of commands run by a specific user, you have to run the command below.
top -u root
How to highlight running processes: If you want to see the running process of the top command in colorful, then after executing the top command, press the ‘z’ button.
Short Running Process By PID Uses the ‘M’ and ‘T’ keys to display all the running processes in the system based on the PID.
Kill running process By PID: If you want to kill a process without leaving the top Windows, then press the ‘K’ button from the keyboard, write PID Of that command, and press Enter.
Show the Process By CPU Utilisation If you want to see the CPU utilization report of the system with the help of the top command, then press ‘shift + P’ .
Display absolute path of the process If you want to know the absolute path of the process running after executing the top command press the ‘c’ button.
Check System CPU Core and Core Utilisation If you want to find out how many cores are there in the CPU which is installed in the system and how much load is on each core of the process running in the system, you can press ‘1’ after executing the top command. This command is used in system trouble showing.
Show All System Idle process If you want to display the list of all idle/sleeping processes in the system, then press the ‘i’ button.
Need Top Command-related Help If you do not know all the options related to top command and you need system help about Top Command, then press the ‘h’ key.
Change priority of the process Uses the ‘r’ option to change the process priority of the commands running in the system. It is also called Renice priority.
Change Refresh Interval Time By Defaults the refresh interval time of the Top command is 3.0 seconds but if you want to change this time as per your requirement then press ‘d’ after executing the top command and set your desired Refresh Interval time.
As you can see in the below screen I have changed the top Refresh interval time from 3.0 seconds to 10 seconds.
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