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Linux is one of the UNIX operating systems such as Solaris, AIX, HP-UX, IRIX ... etcMostly Linux is found on x86 architecture where it has been originally developed (although ported to other architectures)Other UNIX operating systems are mostly found on RISC architectures (with minor exceptions such as Solaris x86)All UNIX operating systems follow standards such as BSD and SVR4
As far as i can understand
Linux == ( Redhat, Fedora, Ubuntu, Debian, Suse )
Unix == (Solaris, MacOsx, HP Unix, AIX5/6/7, Redhat, Fedora ( All Linux ) ).
Unix is superset and Linux is subset.
Otherwise mostly same.