题目内容

用awk模拟命令”paste -sd,”$ cat addr.txtHello WorldHow are youThis game is goodToday is sunny12345You are funny# 将所有行用逗号','拼接起来$ paste -sd, addr.txtHello World,How are you,This game is good,Today is sunny,12345,You are funny# 请确保合并后行尾没有逗号','且行尾有换行$ awk addr.txtHello World,How are you,This game is good,Today is sunny,12345,You are funny$ 如果输入仅有一行，也要确保合并后行尾没有逗号','$ printf 'foo' | paste -sd,foo$ printf 'foo' | awk foo

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为文件scores.csv添加一列，列名为GP，该列的值为数学成绩(权重50%)、物理成绩（权重25%）和化学成绩（权重25%）加权和$ cat scores.csvName,Maths,Physics,ChemistryBlue,67,46,99Lin,78,83,80Er,56,79,92Cy,97,98,95Ort,68,72,66Ith,100,100,100$ awk ____________________ scores.csvName,Maths,Physics,Chemistry,GPBlue,67,46,99,69.75Lin,78,83,80,79.75Er,56,79,92,70.75Cy,97,98,95,96.75Ort,68,72,66,68.5Ith,100,100,100,100

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使用____函数可以确定集合内有多少个元素

A. long()
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