This is a free e-book provided by www.bookboon.com (http://www.bookboon.com). And if you want to program C in linux, just give it a try.
The website also provides the source code.
E-book link : http://bookboon.com/uk/student/it/c-programming-in-linux (http://bookboon.com/uk/student/it/c-programming-in-linux)
Source : http://bookboon.com/count/jlqlv (http://bookboon.com/count/jlqlv)
Only annoying thing is that it contains some add. >:(
Using a series of web development examples, the free book C Programming in Linux will give an interesting glimpse into a powerful lower-level world.