Whenever Jim starts his laptop he sees some commands and numbers appearing on his screen these instructions are being processed by the control unit

The answer is processor.

Processors are single small chip on the motherboard that process and handles commands and instructions that is carried out by Operating System and communicates to the hardware to make the computer usable and functioning well. You can execute commands and instructions directly to the processor by using binary and assembly language. But for simple and common computer users, they can just use Operating System to communicate with the processor and the hardware.