Running the following command without any options displays all three reports. This utility display system’s average CPU utilization since the last reboot. The iostat command list CPU utilization, device utilization and network file system utilization. 'U' to view processes owned by a specific user.'S' to sort by how long the processes have been running type.'I' to remove the idle processes from the display and to revert back press 'I' again.To modify the output of top command, press: Type 'top' from the terminal to view the statistical data related to the performance of a system. By default, the top command updates data every 5 seconds. The top command displays a real-time view of performance-related data of all running processes in a system.
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