There are priced distros for Linux like Red Hat Linux also, but they are normally cheaper than Windows. Linux can be freely distributed, downloaded freely, distributed through magazines, Books etc. The Command Line Interface is optional in Linux. Linux comes with KDE and Gnome as its GUI environment. The Linux OS has both Graphical User Interface (GUI) as well as Command Line Interface (CLI). The Linux kernel is developed by the community and Linus Torvalds oversees things. In addition to the command line interface, Linux has a graphical user interface like Windows operating system and applications to make it a complete operating system. Linux is basically the name of the Kernel and was developed in 1991. Linux is an open source operating system based on Unix. Most gadgets that you can think of except your laptop or PC run on some Linux distro. They don’t encourage open source developments. The Unix OS is mainly used on large server systems, mainframes, expensive and high-end computer systems at big MNCs and institutions. Unix is being developed, maintained and updated by AT&T developers. It is mostly used in big data servers around the world. Unix installation is comparatively much costlier than Linux since it requires special hardware and can be run only on specific CPU processors. You cannot modify and sell your version of Unix therefore. Since Unix OS is not a freeware and therefore its source code is not available. Unix installation requires a strict and well-defined hardware machinery and works only on specific CPU machines. It has less compatibility with different types of hardware. Unix is not free. Different flavors of Unix have different cost structures according to vendors. As said above, it was developed by Bell Labs for its own use but over the years was licensed to other tech companies. The Unix OS works primarily on Command Line Interface, though, recently, there have been developments for GUI on Unix systems. Unix is a proprietary software operating system. What is the difference between UNIX and LINUX operating systems? Unix Operating System

Differences between operating systems