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For example , in page http://man7.org/linux/man-pages/man2/bpf.2.html

What does the (2) mean in bpf(2) ?

codefx
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    That's the man page section, see https://en.wikipedia.org/wiki/Man_page#Manual_sections . Section 2 is usually for system calls. – FBergo Jul 04 '18 at 22:34
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    In some cases there are distinct man pages with same name in different sections, such as printf(1) and printf(3) and readdir(2) and readdir(3). – FBergo Jul 04 '18 at 22:36

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