In Linux menu (man7.org), there are sometimes multiple pages dedicated to the same function. In these pages, there is a number in the bracket of the function. For example, for the pipe() function, there are at least two pages: pipe(2) and pipe(7). What does the number stand for?
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See [What do the numbers in a man page mean](https://unix.stackexchange.com/questions/3586/what-do-the-numbers-in-a-man-page-mean/3607#3607) – Barmar Oct 02 '21 at 07:08
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Did you read `pipe(7)`? It's not about the function, it's an overview of the concept of pipes. – Barmar Oct 02 '21 at 07:10
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did you try `man man`? – stark Oct 02 '21 at 12:17