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單項(xiàng)選擇題

Given the following scripts， what output would be generated？（）

A.The sky is red.
B.The sky is blue.
C.The sky is green.
D.The sky is yellow.

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單項(xiàng)選擇題

Given the following scripts， both found in /usr/local/bin， what would the output be when executing /usr/local/bin/script1？（）

A.dog cat
B.dog fish
C.mouse cat
D.mouse fish

單項(xiàng)選擇題

How can permissions be set up on /tmp so that a user cannot delete another user’s files？（）

A.chmod +s /tmp
B.chmod 775 /tmp
C.chmod 1777 /tmp
D.chmod 4755 /tmp