Before Unix, several operating systems were in use, notably Multics, which was developed in the 1960s as a collaborative project between MIT, Bell Labs, and General Electric. Multics aimed to provide a secure and multi-user environment but was complex and resource-intensive. Unix was developed at Bell Labs in the late 1960s and early 1970s as a simpler alternative to Multics, focusing on portability and ease of use. Other earlier systems included CTSS (Compatible Time-Sharing System) and DOS (Disk Operating System) variants, which were primarily single-user systems.
"Linux" as a operating system distribution (which includes the kernel as created by Linus Torvalds), was in some way influenced by Unix (this includes Apple's Mac OS and OS X, which was based on BSD, which was derived from Unix) at some point in their development.
No difference, really. Unix is an OS (Operating System)
For PCs, MS-DOS came before Windows. Other platforms had CPM, Unix, or their own OS they called DOS. Some had no operating system at all, just some BIOS routines and built-in BASIC, and any software pretty much having to write what bit of OS they needed. Even early PCs could be run without an OS if the BASIC ROM was installed.
Unix came first; Linux is a clone of the Unix Operating System.
unix.
UNIX is a command-based OS. In contrast, Windows is a menu-based OS.
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.
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."
Yes.