Linux is an operating system kernel, and UNIX is a certification for operating systems.
rnThe UNIX standard evolved from the original Unix system developed at Bell Labs. After Unix System V, it ceased to be developed as a single operating system, and was instead developed by various competing companies, such as Solaris (from Sun Microsystems), AIX (from IBM), HP-UX (from Hewlett-Packard), and IRIX (from Silicon Graphics). UNIX is a specification for baseline interoperability between these systems, even though there are many major architectural differences between them.
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rnLinux has never been certified as being a version of UNIX, so it is described as being "Unix-like." A comprehensive list of differences between Linux and "UNIX" isn't possible, because there are several completely different "UNIX" systems.
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rnReference:- http://tech.queryhome.com//29469/what-the-difference-between-linux-and-unix-operating-systems
Linux is GUI and UNIX is CUI. GUI(Graphical User InTerface )