0     Header files

0p    Header files (POSIX)

1     Executable programs or shell commands

1p    Executable programs or shell commands (POSIX)

2     System calls (functions provided by the kernel)

3     Library calls (functions within program libraries)

3n    Network Functions

3p    Perl Modules

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

l     Local documentation

n     New manpages

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