Ok. I have been learning C and C++ enough. I am decent enough wtih the language, but I have not really made any useful programs, or any programs that I can be proud of. So, I would like to start making something that at least takes some knowledge to do.

Where is a good place to start learning about hardcore linux programming. And I dont mean hardcore as in..starts off hard right away, I mean..stuff like..hmm..

A.) Some C header files that you can interface with the kernel..like sysctl?

B.) Shell programming (not scripting..like what makes a shell tick..making a shell)

C.) Modules? I love modules. I find them fascinating. I would love to know how they work.

Stuff like that. Where is a good place to get started with that kind of programming. For free preferably

hi,
u can get good knowladge from:
1. Linux Device Drivers - O'Reilly publications
2. Linux Kernel Internals - O'Reilly Publications
Have a good time with linux.

The Linux Documentation Project has got a good deal of information about modules... there is one called Linux Module Programming I think. The Kernel sources also contain A LOT of good information. But be careful: i noted that when I compiled a new Kernel, it erased many useful docs (when running make mrproper)
If you want to do some more general Linux programming, then www.advancedlinuxprogramming.com might help. It expects general understanding of C/C++ and covers many important aspects of Linuxprogramming.^
Shell Programming... well the book above does cover a llttle bit what you're looking for, but it might not be enough... It might be very hard to find anything about it. May be the bash sources contain some useful docs. Or may be you're really good and understand the bash code
Well, happy

Shell Programming Book.

Linux Shells by Example by Ellie Quigley
http://www.amazon.com/exec/obidos/AS...011975-7213528

If you are looking for a good general overview of unix programing i recommend advacned programing in the unix environment by stevens (link here )

sounds like you're interested in kernel programming. try kernelnewbies, http://www.kernelnewbies.org/

someone mentioned stevens. I strongly agree. although the shell stuff you can get in many intro books, because the concept of a shell is so simple. You can right a very simple shell in a few lines of code.

You should download interesting programs from http://sourceforge.net and try to read and understand the code.

Following development mailing list for interesting apps is also helpful, I think