The meaning of the number displayed on the man page in Linux
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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