Na página man de man
em si (isso é o mais meta possível :)):
man man
Ou para ser mais específico (consulte Comentário de jordanm :
man 1 man
para obter a página man(1)
.
Citando o acima:
The table below shows the section numbers of the manual followed by the types of pages they contain.
1 Executable programs or shell commands 2 System calls (functions provided by the kernel) 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), e.g. man(7), groff(7) 8 System administration commands (usually only for root) 9 Kernel routines [Non standard]