Just learned c language ,but I don't know where to start to write some applications under Linux ,I really appreciate it if anybody can help me find some books or sites on it.
The Linux Programming Interface: A Linux and UNIX System Programming Handbook
by Michael Kerrisk
Regards,
Alister
This is definitely the best book on Linux programming (on the Linux programming interface, more accurately). But there is an alternative you should try: Advanced Linux Programming, by Mark Mitchell, Jeffrey Oldham, and Alex Samuel. This book is published under the Open Publication License, meaning that you can download the full book free of charge, and also buy the printed version if you like it. In my opinion, you should buy both books.