In the year 1960, AT&T Bell Labs first introduced UNIX. The fathers of UNIX, Dennis Ritchie and James Thompson made UNIX available for commercial use in the year 1970. From then onwards it has gradually become popular worldwide Linux was introduced in the year 1991 by Linus Torvalds. Till date it is one of the most popular operating systems that has been recommended worldwide. It is much more secured compared to any other OS
UNIX is such an operating system where the target audience and the platform is quite specific and does not allow much variation. It is strict in regards to the set up environment  Linux is diverse in nature. They have wide variety of target audience so they do not follow strict set up of the environment
UNIX is based on standards. Thus consistency is maintained between the different versions of UNIX. The developers of UNIX are from same domain and does not encourage emulating features of other operating systems On the other hand, Linux does not follow any standards. For developers it is a benefit as the features of other operating systems can be easily emulated. But when Linux tries to emulate features of UNIX, the confusion occurs there
UNIX has a simple hardware architecture. Hence the developer has a hold on every feature available in the device. The code is optimized Linux has a compatible hardware. There are about dozen of different types of architecture that is supported in Linux. Most noticeable feature is that, the external devices and I/O can be used multiple times. The code is difficult to be optimized. They face few issues for that as well
UNIX does not provide free access to the kernel source code. So the compilation and patches have different variants. Moreover the kernels are mostly released in monolithic package or binary format so that it cannot be modified The kernel of Linux has a free source code.It encapsulates the patches in the form of source code so that they can be easily accessed by users just by installing it as a plugin to their system
UNIX has compatibility to very less number of file systems. It supports about 2 to 3 types of file systems. For this UNIX is not gaining much popularity in current market trend. It supports the journaling of file system which are critical operating system component. The standardization of file systems has restricted in supported most of the file formats The most powerful feature of Linux is that it supports almost all types of file systems available. But it is not much compatible with journaling of file system. Since Linux does not provide standardization thus it can support resizing, mirroring, quota support, file access control lists
UNIX has the base in original UNIX tools. UNIX has a pool of non-free or closed source software and applications available as it maintains a standard and are consistent. UNIX does n access to GNU tools Linux has base on GNU tools. When it comes to free and open source software or applications Linux uncountable numbers. But it is not much popular when licensed applications are considered
UNIX has a different management tool for system administration. With this tool the system can be modified and managed. Example SAM(System Administration Manager) for HP-UX Linux supports a standard system administration tool SUSE’s YaST. But it has compatibility to command lines and text files as well. But the later becomes complex and hard to keep in mind. As Linux has multiple variation in its applications there are wide range of package management kit. The kit is selected based on the version of Linux used in the system