focal
20.04 LTS		jammy
22.04 LTS		mantic
23.10		noble
24.04 LTS		Section Description
umask(1)umask(1)umask(1)umask(1)(1) - Executable programs or shell commands
umask(2), umask(2)umask(2), umask(2)umask(2), umask(2)umask(2), umask(2)(2) - System calls (functions provided by the kernel)
umask(3)umask(3)umask(3)umask(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)