它演示了如何在管道中以及在输入、输出和错误流重定向的情况下使用该工具。
It shows how to use the tool in pipelines and with redirection of input, output, and error streams.
如果是,将创建一个错误消息并重定向到索引页面。
If it has, an error message is created and you redirect to the index page.
同时,selpg 进程在后台运行,并且标准输出和标准错误都被重定向至文件。
Meanwhile, the selpg process runs in the background, with stdout and stderr both redirected to files.
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