For example, place all those fields which might be used in decision making to route the messages at the beginning of the message.

例如，将所有这些可能使用的字段都放置在决策中，以在消息的开始位置路由消息。

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Listing 4 shows the beginning of the sample wrapper script, which defines a usage message that displays if you execute the script with no arguments or the wrong number of arguments.

清单4给出了此示例包装器脚本的开始部分，其中定义了一个使用消息，如果在没有参数或参数数量错误的情况下执行该脚本，就会显示这个消息。

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Figure 4 shows the defaults of 5 MB for the total message size and 2 MB worth of NSD output, which is read starting from the beginning of the file, so it's the first 2 MB of the file that is used.

图4显示消息总大小的默认值是5 MB, NSD输出是2 MB，因为NSD输出是从文件的开头开始读取的，所以它是文件的前2 MB。

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