1 Commands
                        Those commands that can be executed by the user  from
                        within a shell.

              2 System calls
                        Those  functions  which must be performed by the ker-
                        nel.

              3 Library calls
                        Most of the libc functions, such as qsort(3).

              4 Special files
                        Files found in /dev.

              5 File formats and conventions
                        The format for /etc/passwd and  other  human-readable
                        files.

              6 Games

              7 Conventions and miscellaneous
                        A  description  of  the  standard file system layout,
                        network protocols, ASCII and other  character  codes,
                        this man page, and other things.

              8 System management commands
                        Commands  like  mount(8), many of which only root can
                        execute.

              9 Kernel routines
                        This is an obsolete  manual  section.   Once  it  was
                        thought  a  good  idea  to  document the Linux kernel
                        here, but in fact very little  has  been  documented,
                        and   the   documentation  that  exists  is  outdated
                        already. There are better sources of information  for
                        kernel developers.
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