Stdout and stderr

Source: Internet
Author: User
Stdout and stderr are both built-in files in Unix/Linux systems. Together with stdin, they are automatically generated after each process is started. The numbers are 0, 1, and 2.

It should be noted that for stdout, This is a file stream with a buffer, that is, the string output to stdout may not be immediately displayed. Therefore, for stdout, you can use methods like fflush (stdout) to force the output.

But stderr is different, because the output is an error message, the string output to stderr will be immediately displayed.

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