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A comment on If everything in Unix development is POSIX, what the hell does C library do?. Parent comment

Re:If everything in Unix development is POSIX, what the hell... by daxelrod on Sunday January 02, 2011 @05:58PM (#2061387)
Those are Unix manpage section numbers. fseek(3) means fseek in section 3 of the manpages. This can help to differentiate between a command line program and C function of the same name, for example. See http://www.december.com/unix/ref/mansec.html
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