It reads data from standard input line by line.

它从标准输入逐行读取数据。

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Normally, awk executes each block of your script's code once for each input line.

通常，awk会针对每个输入行执行一次每个代码块。

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There should be one output line for each input line.

每行输入对应一行输出。

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There should be one output line for each input line.

每行输入对应一行输出。

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