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.
No, it is unix-based but Linux is a kernel not an operating system.Ubuntu,Linux Mint,Debian,and puppy Linux,ect. are OS's that use the Linux kernel.
No, but Linux is based on Unix since Linux is a Unix clone.
This can vary depending on the Unix/Linux distribution. Your best bet is to use the 'man mount' or 'info mount' commands.
Linux is an open system, Unix is not.
Linux is not illegal. Linux is a free, public license software modeled on Unix.
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Because Linux is actually more popular in most fields these days than certified Unix.
what are similarities and differences between linux and unix?
Linux and Unix do have their share of malware, though there are fewer of them.
Because Linux evolved from UNIX, but Windows evolved from DOS.
Linux, Minix, Coherent, FreeBSD, etc. These are all clones of Unix