TIL: Number in Man Page Titles (E.g. Sleep(3))
The article explains the meaning of the numbers found in Linux man page titles, such as sleep(3) or read(2). These numbers indicate the manual section: for example, section 1 covers executable programs, section 2 system calls, and section 3 library calls, with additional suffix letters denoting standards like POSIX or X documentation. The author discovered this detail after a code review clarified the correct section reference for a function’s man page.
https://lalitm.com/til-number-in-man-page-titles-e-g-sleep-3/