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).
To enter into Unix, you can use a terminal emulator on a Unix-based operating system like Linux or macOS. Additionally, you can access Unix remotely via SSH (Secure Shell) from another computer. Alternatively, you can use a virtual machine or a container, such as Docker, to run a Unix environment on a non-Unix system. Lastly, you can boot from a live USB or CD containing a Unix distribution.
If they are a root level user they have access to just about everything.
Unix work is performed by users of the unix system, for application and system programs, or anything that requires a Unix system.
UUCP is the abbriviation of Unix to Unix copy. It is worldwide email system called UUCP or Unix to Unix copy.This email system was developed for the operating system called Unix.
No. Linux, like Unix, is designed to be a multi-user system.
Depends on the operating system. In UNIX it's ncurses,see the manual.
Unix came first; Linux is a clone of the Unix Operating System.
Yes. UNIX is a computer operating system.
Linux is an open system, Unix is not.
Yes, Unix is system software. It is a kind of operating system.
The operation and maintenance of a Unix system.
There is no the system file. There are many files necessary to create a working Unix system.