precise
12.04 LTS
trusty
14.04 LTS
xenial
16.04 LTS
bionic
18.04 LTS
cosmic
18.10
disco
19.04
Section Description
kill(1), kill(1)kill(1), kill(1)kill(1), kill(1)kill(1), kill(1)kill(1), kill(1)kill(1), kill(1)(1) - Executable programs or shell commands
kill(2), kill(2)kill(2), kill(2)kill(2), kill(2)kill(2), kill(2)kill(2), kill(2)kill(2), kill(2)(2) - System calls (functions provided by the kernel)
kill(3)kill(3)kill(3)kill(3)kill(3)kill(3)(3) - Library calls (functions within program libraries)
......(4) - Special files (usually found in /dev)
......(5) - File formats and conventions eg /etc/passwd
......(6) - Games
......(7) - Miscellaneous (including macro packages and conventions)
......(8) - System administration commands (usually only for root)