Man

NAME
    The name of the command or function, followed by a one-line description of what it does.
SYNOPSIS
    In the case of a command, you get a formal description of how to run it and what command line options it takes.
DESCRIPTION
    A textual description of the functioning of the command or function.
EXAMPLES
    Some examples of common usage.
SEE ALSO
    A list of related commands or functions.
BUGS
    List known bugs.
AUTHOR
   Specify your contact information.
COPYRIGHT
    Specify your copyright information.

The manual is generally split into eight numbered sections, organized as follows under Linux or UNIX like oses:

• Section Description
• 1 Executable 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]

Simply type the following command:

cp nuseradd /usr/local/man/man8/nuseradd.1
gzip /usr/local/man/man8/nuseradd.1
man nuseradd

You can also use install command as follows (recommend for shell scripts):

install -g 0 -o 0 -m 0644 nuseradd.1 /usr/local/man/man8/
gzip /usr/local/man/man8/nuseradd.1