No difference, really. Unix is an OS (Operating System)
Unix is a specification. Mac OS X is a certified implementation of Unix. This like asking "What is the difference between a turtle and a red-eared slider."
UNIX is a command-based OS. In contrast, Windows is a menu-based OS.
su substitute user.. and su is a unix command used to run the shell of another user without logging off..
It's a meaningless phrase.
what are similarities and differences between linux and unix?
Command set and command switches. Both are based on the UNIX operating system, so they have the core of the operating system in common.
Unix is an operating system, Java is a language.
unix.
kernel is everything in unix os
Why do you believe this is necessary? What OS are you talking about?
LINUX and UNIX are vendor independent OS
Hewlett-Packard Unix. It is a series of computers that runs the Unix OS. Most people recognize the HP as a computer company in the acronym. This their version with the Unix OS.