1·This is in addition to stdout and any log file defined in the command line.
这是对标准输出和命令行定义的日志文件的补充。
2·But this feature is useful when stdout has already been redirected to another source, on the same command line, and you want stderr to go to the same destination. For example.
在标准输出已被重定向至其它源，而您希望在同一命令行上将标准错误也写至同一目的地时，该特性就非常有用。
3·Since the -debug command line option is specified, you'll see some startup messages that were directed to stdout.
由于已经指定了- debug命令行参数，您将会看到定向到标准输出的一些启动消息。
4·Meanwhile, the selpg process runs in the background, with stdout and stderr both redirected to files.
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。
5·This will write page 1 of "input_file" to stdout (the screen), since there is no redirection or piping.
该命令将把“input_file”的第 1 页写至标准输出（也就是屏幕），因为这里没有重定向或管道。