a. Why is UNIX systems security difficult to describe generally? b. Distinguish between UNIX and Linux. c. What is the Linux kernel? d. What is a Linux distribution? e. Comment on the cost of Linux....

a. Why is UNIX systems security difficult to describe generally? b. Distinguish between UNIX and Linux. c. What is the Linux kernel? d. What is a Linux distribution? e. Comment on the cost of Linux. f. Does a particular version of UNIX have a single user interface? g. What are UNIX CLIs called? h. How are CLIs beneficial? i. Why are CLIs difficult to use?