a) Why is UNIX systems security difficult to describe generally? b) Distinguish between UNIX and Linux. c)

Question:

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?