If you have quadcore CPU, each processor core will be referred as cpu0, cpu1, cpu2, and cpu3. Method 1: The free command Since the free command is the most widely used and, without any doubt, the most helpful, we will mention its usage first. You can open Terminal using the system dash or the Ctrl+alt+T key combination. Please note that processor core number will start from 0(zero). To view memory usage, we use the Ubuntu command line and Terminal application. This would be helpful if you have a multi-core CPU. To display the second core, run: $ mpstat -P 1 If you want to view the CPU usage of a specific processor core, for example the first processor core, run: $ mpstat -P 0
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