Unix can be run on a variety of server, mainframe, and workstation devices.
The AS/400 is a specific piece of hardware manufactured by IBM corporation. It runs its own operating system. Unix is the designation for an Operating System and runs on multiple hardware. To my knowledge the AS/400 does not run any version of Unix.
The base part of the two systems are the same. Solaris is a Unix system from Oracle (Sun Microsystems) AIX is a Unix system from IBM. They also run on different hardware chipsets.
No, Unix is an operating system program. A utility program cannot run by itself; it runs under an operating system.
see: What_is_the_cost_of_a_Unix_server
Unix can be used on a large number of mainframes, servers, and workstations. If you would like to use a certified UNIX system on commodity hardware, Solaris 10 can be downloaded free of charge for non-commercial use.
unix.
That would depend greatly on what version of Unix you are talking about. Unix systems have been around for about 40 years. In that time, computers have gotten more powerful, and the Unix systems have gained more functionality and taken on new uses. This means that anything from a PDP-7 with 9KB of RAM and a tape reel to an HP 9000 Superdome with 128 processor cores and 2 TB of RAM can run a version of Unix.
Many versions of Unix can be run on microcomputers. Xenix, Solaris, Mac OS X, and IRIX all run on microcomputers.
Unix is not very popular with the general public. A more popular version is Linux. Around twenty percent tend to run on this system. Unix has competition also.
In most cases you probably won't have a choice. If you need to run a specific commercial application, it may available for Linux but not a Unix system, or vice versa. The hardware platform also dictates whether or not you may be able to use them. HP-UX (a Unix system) for instance, only runs on certain HP machines. Similarly, some hardware platforms may not be supported by any current Linux distributions, meaning you may not be able to use Linux on that system.
Yes and no. If you have the hardware resources to run UNIX/Linux then you should. DOSBox can run any DOS program in UNIX, so there is no need for DOS if you can run UNIX. However, if you have an older computer or an embedded system where UNIX or Linux would have too much overhead, DOS is a better choice.
By typing its name into the shell