如何重定向和恢复STDOUT
STDOUT是Perl的标准输出文件句柄。除非指定了文件句柄，否则Perl中所有标准输出都将输出到终端。因为STDOUT只是一个全局变量，所以它可以被重定向和恢复。想在不需要更改源代码中的每个print语句的情况下实现程序日志记录？想捕获Perl CRON作业的标准输出？请继续阅读。
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