The Linux kernel

                                               The Linux kernel

The base of Linux is the kernel. You could replace each and every library, but as long
as the Linux kernel remained, it would still be Linux. The kernel contains device drivers,
memory management, process management and communication management. The kernel
hacker gurus follow POSIX guidelines which sometimes makes programming easier and
sometimes harder. If your program behaves differently on a new Linux kernel release,
chances are that a new POSIX guideline has been implemented. For programming information
about the Linux kernel, read the Linux Kernel Hacker’s Guide.