Linux, Minix, Coherent, FreeBSD, etc. These are all clones of Unix
GNU/Linux is a 'Unix-like' operating system because it was based on Unix, and is similar in many ways.
In order to legally be called a "Unix" system, operating systems must undergo a rigorous and expensive certification procedure. "Unix-like" refers to systems that have an architecture similar to Unix, but have not undergone certification.
GNU/Linux, and the BSD descendants follow design and operation principles largely similar to UNIX.
Linux comes closest to mind.
The question is rather vague; the applications used in Unix are similar or identical to those used in other operating systems, such as Windows.
Commands you use in a Unix based computer OS to achieve certain things. Similar to MS/DOS commands in Windows. Mostly used in computers running the Linux OS. unix command
You access Unix the same or similar way that you access any other Operating System; you provide a username and a password and log in. From there, you use the shell interpreter to tell it what to do (in a similar way from Windows, for example).
'cat' is short for concatenation; it is a Unix utility program to print the contents of 1 or more files on the standard output. It is similar to the 'type' command in Windows.
vxworks is used to control network and communication devices. vxworks is similar to unix but it uses less processing power than unix.
The reason for the exec functions being same/similar is because the Mac OS has its roots in variants of the Unix kernel.
Yes, UNIX still exists, though its direct use has declined over the years. It has evolved into various derivatives and similar operating systems, such as Linux, BSD, and macOS, which share many principles and features of the original UNIX. Additionally, some organizations continue to use traditional UNIX systems for specific applications and environments. Overall, the legacy and influence of UNIX remain significant in modern computing.
A Unix clone is an operating system that is designed to be compatible with the original Unix operating system, typically by replicating its functionality, commands, and programming interfaces. These clones often aim to provide a similar user experience while being developed independently. Examples include Linux and BSD systems, which share core Unix-like features but differ in design, architecture, and licensing. Unix clones have significantly contributed to the proliferation of Unix-like systems in various computing environments.