focal
20.04 LTS		jammy
22.04 LTS		mantic
23.10		noble
24.04 LTS		Section Description
hostname(1)hostname(1)hostname(1)hostname(1)(1) - Executable programs or shell commands
....(2) - System calls (functions provided by the kernel)
hostname(3)hostname(3)hostname(3)hostname(3)(3) - Library calls (functions within program libraries)
....(4) - Special files (usually found in /dev)
hostname(5)hostname(5)hostname(5)hostname(5)(5) - File formats and conventions eg /etc/passwd
....(6) - Games
hostname(7)hostname(7)hostname(7)hostname(7)(7) - Miscellaneous (including macro packages and conventions)
....(8) - System administration commands (usually only for root)