awk是一种用于处理数据和生成报告的编程语言。
一般的使用格式是:
awk ‘{pattern + action}’ {filenames}
pattern指在每一行中进行匹配的条件,action指针对符合条件的行进行的操作,filenames是输入的文件名。
假设data文件中有以下数据:
1 donald 305 20050129
2 chin 102 20040129
3 mark 304 20040229
下面对这个文件进行操作:
awk ‘{print $1, $2, $3, $4}’ data
输出:
1 donald 305 20050129
2 chin 102 20040129
3 mark 304 20040229
awk ‘{print $1″t”, $2″t”, $3″t”, $4}’ data
输出:
1 donald 305 20050129
2 chin 102 20040129
3 mark 304 20040229
这里显示的格式并不是输出的真实格式,真实格式是中间会有一个tab符号,格式对的很整齐,只不过在html里看不出来。

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