a2zinterviews

26.	What is Kernel?
	Kernel is core part of unix o/s. It is a group of hundreds of system calls.

27.	What are the different security features in Unix?
	Password protection File permissions Encryption.

28.	What does the swapping system do if it identifies the illegal page for swapping?
	If the disk block descriptor does not contain any record of the faulted page, then this causes the attempted memory reference is invalid and the kernel sends a “Segmentation violation” signal to the offending process. This happens when the swapping system identifies any invalid memory reference.

29.	How do you find out the current directory you’re in?
	pwd