Something about Man

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man1: User programs.
Manual pages that describe publicly accessible commands are contained in
this chapter.  Most program documentation that a user will need to use
is located here.
man2: System calls.
This section describes all of the system calls (requests for the
kernel to perform operations).
man3: Library functions and subroutines.
Section 3 describes program library routines that are not direct calls
to kernel services.  This and chapter 2 are only really of interest to
programmers.
man4: Special files.
Section 4 describes the special files, related driver functions, and
networking support available in the system.  Typically, this includes
the device files found in /dev and the kernel interface to
networking protocol support.
man5: File formats.
The formats for many data files are documented in the
section 5.  This includes various include files, program output files,
and system files.
man6: Games.
This chapter documents games, demos, and generally trivial programs.
Different people have various notions about how essential this is.
man7: Miscellaneous.
Manual pages that are difficult to classify are designated as being
section 7.  The troff and other text processing macro packages are found
here.
man8: System administration
Programs used by system administrators for system operation and
maintenance are documented here.  Some of these programs are also
occasionally useful for normal users.

               
               
               

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