打印到文件时，获取或设置文件名。
cat (“concatenate”的缩写)命令在其输入上接受一个或多个文件并将它们作为一个单独的文件打印到它的输出。
The cat (short for "concatenate") command takes one or more files on its input and prints them to its output as a single file.
在清单4的Scilab代码内，一个示例图形被打印到一个JPEG文件。
In the Scilab code in Listing 4, an example graph is printed to a JPEG file.
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