Linked by David Adams on Thu 3rd Mar 2011 20:23 UTC, submitted by Amy Bennett
Hardware, Embedded Systems IDC's newest survey of server vendors shows boxes running every kind of operating system -- except Unix -- sold more during the last three months of 2010. Sales of Linux servers rose 29 percent; Windows rose 16.8 percent, but most surprisingly, sales of mainframes shot up 69 percent " the highest growth rate IDC ever found on mainframes.
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"Linux isn't Unix, it is rather a written-from-scratch independent implementation...

Yes Linux was written from scratch, so is Solaris or AIX or HP-UX or even *BSD. All of them are Unix!

No, Solaris or AIX or HP-UX and even *BSD were not written from scratch. They all inherited an existing codebase that came before them, they are all "forks" of an earlier version of Unix. They are all Unix.

Only Linux, and the original Unix itself, were written from scratch.

Linux is not Unix. There is not one line of Unix source code in Linux. Linux was written from scratch, by Linus Torvalds.

Like so:

In this figure, solid lines entering from the left represent existing source code.

Do you understand now?

PS: BTW, the GNU/Linux OS uses GNU (and GNU was written from scratch, by Richard Stallman), but the Linux kernel itself does not use GNU, so the Linux kernel was also written from scratch. Android uses the Linux kernel, but it does not use GNU AFAIK.

GNU is also not Unix. In fact, the very abbreviation, GNU, satnds for GNU is Not Unix.
"GNU is a recursive acronym for "GNU's Not Unix!", chosen because GNU's design is Unix-like, but differs from Unix by being free software and containing no Unix code."

Edited 2011-03-04 12:27 UTC

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