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linux IS a flavour of unix, as are solaris, BSD....etc.
If by "version of linux" you mean the version of the compiled kernel currently running then the command by the above poster will do, or:
note that "Linux" can refer specifically to the kernel, although it is also generally used for a distribution on the whole.
each distribution is a collection of applications, assigned an overall version number arbitrarily by each distribution creator. you cannot conclude anything by comparing the version numbers between different distros. the method to find a version of a distro will depend on which you are using.
@dshu if it is some off the shelf nas box, then you will have some sort of embedded linux probably with busybox and a specialised libc, possibly put together in house by the hardware manufacture.
Have a poke around the file system (/etc in particular). Also, you should be able to find out exactly what you are running by going to the web site of the manufacturer: the source code should be available there.