这样的函数简单地读取参数，预计他们存在。

So the function simply reads the parameters from where it expects them to exist.

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请求处理类从 reqeust 中读取参数值，如下所示

The request processing class reads the parameter values from the request as follows

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cat命令读取参数中指定的每个文件，并将这些文件的内容写入到stdout。

The cat command reads each of the files specified in its arguments and writes the content of the files to stdout.

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