The kernel i n Unix

The kernel of UNIX is the hub of the operating system: it allocates time and memory to programs and handles the filestore and communications in response to system calls.

As an illustration of the way that the shell and the kernel work together, suppose a user types rm myfile (which has the effect of removing the file myfile). The shell searches the filestore for the file containing the program rm, and then requests the kernel, through system calls, to execute the program rm on myfile. When the process rm myfile has finished running, the shell then returns the UNIX prompt % to the user, indicating that it is waiting for further commands.

what is kernal upgradation

What is kernal upgradation?

kernel updation is a process of to upgrade the kernel file with a new or latest version of kernel & use of them as a default kernel.or we can say as 

Kernel updation is upgrading kernel version. To update kernel either you can enroll yourself to the official website of red hat or you can simply download the latest kernel version and then running rpm -u kernel version. But this method is not recommended, it is better to install the new kernel and let the older version of it remain untouched so that you can revert back the changes.
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