„Linux is a Unix clone written from scratch by Linus Torvalds with assistance from a loosely-knit team of hackers across the Net. It aims towards POSIX compliance.“

Source: http://www.cyberciti.biz/faq/what-is-the-difference-between-linux-and-unix/

This is what CDE Unix Desktop looked like in 1999: (RISC technology!)


„It gradually sank into obscurity as the x86 PC displaced RISC workstations and Linux replaced the various expensive flavours of Unix, but it never entirely went away.“

Source: http://www.theregister.co.uk/2012/08/09/cde_goes_opensource/


  • POSIX.1c: Threads extensions (IEEE Std 1003.1c-1995)
    • Thread Creation, Control, and Cleanup
    • Thread Scheduling
    • Thread Synchronization
    • Signal Handling

Depending upon the degree of compliance with the standards, one can classify operating systems as fully or partly POSIX compatible. Certified products can be found at the IEEE’s website.[16]


Some versions of the following operating systems have been certified to conform to one or more of the various POSIX standards. This means that they passed the automated conformance tests.[17]

Mostly POSIX-compliant

The following, while not officially certified as POSIX compatible, comply in large part:

Source: https://en.wikipedia.org/wiki/POSIX

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