1 -Linux is Unix, True it's an entry level Unix, but Unix is Unix is Unix - Linux today being just about "just like" Sys VR4 a decade or so back. 2 -the Unix = RISC idea doesn't fly well either.

You can use the stat command to view dates and times associated with Linux files, and the date command can do some handy conversions if you’d like to display the current time in the epoch format.

Compare the cost of "Linux" -meaning gnu/linux on x86 - to the cost of Unix -meaning Solaris on ultraSPARC- and you get a surprise: "Unix" is cheaper provided you need enough capacity to get to ...