xenial
16.04 LTS
bionic
18.04 LTS
focal
20.04 LTS
groovy
20.10
hirsute
21.04
Section Description
.....(1) - Executable programs or shell commands
bind(2), bind(2)bind(2), bind(2)bind(2), bind(2)bind(2), bind(2)bind(2), bind(2)(2) - System calls (functions provided by the kernel)
bind(3), bind(3)bind(3), bind(3)bind(3), bind(3)bind(3), bind(3)bind(3), bind(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)