trusty
14.04 LTS
xenial
16.04 LTS
bionic
18.04 LTS
disco
19.04
eoan
19.10
Section Description
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)(2) - System calls (functions provided by the kernel)
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)