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8.30--Comprehensive software: answer questions daily to gain knowledge

2017-08-30View Original

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8.30--Comprehensive software: Answer questions daily to gain knowledge; those who answer correctly earn 10 wealth points, while those who answer incorrectly earn 3 wealth points. Multiple-choice question: Which of the following is the correct way to operate on the shell variable FRUIT? A. Assigning a value to the variable: $FRUIT=apple B. Displaying the value of the variable: fruit=apple C. Displaying the value of the variable: echo $FRUIT; D. Checking whether the variable has a value:

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