如果在服务器重启时丢失了临时文件目录下的文件，复制将失败。

If was lost when the server restarts temporarily the file below file directory, duplicate will fail.

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使用隐含文件的缺点在于，在临时文件目录所在的位置中，看不到占用了文件系统的大临时文件。

Use implicit the defect of the file depends on, be in temporarily in the position that file directory is in, see less than taking up of file system big temporarily file.

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如果您指定任意命令行参数，跟踪将打开，跟踪消息将被写入当前目录中的一个临时文件。

If you specify any command line parameters, tracing will be turned on and trace messages will be written to a temporary file in the current directory.

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