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/Peo, FreeWebSpace.net
No. Unix is based on a system developed by AT&T. Linux was a system developed 15 (?) years later and was very heavily inspired by unix. Linux nowadays uses most of the programs originally written for Unix.
Some people claim that unix is still more stable+reliable than linux. Unix OSes are: FreeBSD, OpenBSD, NetBSD, Solaris, HP UX, IBM AIX....many many more.