CompTIA認證考試LX0-101單項選擇題每日一練(2019.08.02)

來源：考試資料網(wǎng)

1 The command echo $! will produce what output？（）

2 What command will print a list of usernames （first column） and their corresponding user id （uid， third column） from /etc/passwd？（）

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3 Using vi， you want to save changes to the file myfile with ：w!， but vi complains it cannot write to the file. Therefore， you want to check the write permissions on the file. To do this without leaving vi， you type：（）

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4 What is the difference between thE.remove and thE.purge action with the dpkg command？（）

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5 Which of the following commands makes /bin/foo executable by everyone but writable only by its owner？（）

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