The ultimate reference under Linux is the source code. If you installed it (comes with standard distributions; we really recommend its installation if you have enough hard drive space), it is in /usr/src/linux(the kernel source) and /usr/src/RPM/sources(the source code for the balance of the rpm packages). How can the source code be of use to a newbie? Well, it contains all the comments and documentation down to the smallest detail. For example, later in this guide, we show how to read/set up some of the kernel runtime parameters via the /proc filesystem. You can read the complete documentation for all the available parameters using:
To install kernel sources, I would select the appropriate rpm package during my main installation. To install sources for other packages that came with my distribution, I would put the "Source CD" into the cd drive and do something like (as root, with RedHat CD):
[install the source code for the gnumeric spreadsheet from the cd to the harddrive]
rpm -ivh gnume<Tab>
[unzip the sourcecode which I just installed]
tar -xvzf gnumer<Tab>
[read the code for statistical functions in gnumeric]
This is truly the ultimate reference on how a particular spreadsheet function works, no kidding.