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The GNU HURD is not ready for production use. Fortunately, another kernel is available. In 1991, Linus Torvalds developed a Unix-compatible kernel and called it Linux. Around 1992, combining Linux with the not-quite-complete GNU system resulted in a complete free operating system. (Combining them was a substantial job in itself, of course.) It is due to Linux that we can actually run a version of the GNU system today.
We call this system version GNU/Linux, to express its composition as a combination of the GNU system with Linux as the kernel.