IBM i拥有一个后台打印系统，用于管理各种程序的输出。

IBM I has a print spooling system that manages the output of various programs.

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以这种方法合并STDOUT和STDERR，将阻止STDERR输出在系统控制台上显示并允许程序解析它。

Combining STDOUT and STDERR in this way prevents STDERR output from showing up on the system console and enables the program to parse it.

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如果应用程序运行正确，写到测试环境系统输出文件的消息包含数据对象的序列化XML内容，包括签出的附件。

If the application works correctly, the message written to the test environment system output file contains the serialized XML contents of the data object, including the checked out attachment.

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