When I try to get help on a Unix command, I get reference to say
Why is there a number within parenthesis and what does it refer to exactly ?
The manual is divided into chapters and some topics are actually documented twice, which is often the case when there is a C library function or system call that is also available as a user space command or a config file is available with the same name as the command it documents (example:
Yep, what SvW said. You can get the full doc from man itself by typing: