Greatest common divisor You are encouraged to solve this task according to the task description, using any language you may know. Issuing a $? from the command-line after a shell script exits gives results consistent with the table above only from the Bash or sh prompt. Running the C-shell or tcsh may give different values in some cases. Importantly, you can associate an interrupt request (IRQ) with a GPIO using the last function in the list above. IRQs enable you to build efficient, high-performance code that detects a change in the input state — we need to discuss interrupts and their use under the Linux OS next.
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