Difference between Linux and UNIX
UNIX is a multiuser operating system developed by Ken Thompson and Dennis Ritchie in 1970 at AT&T bell lab. UNIX is proprietary software. Meanwhile, no one can duplicate this operating system because the source code is reserved for the company. UNIX is rigid with hardware and mainly used for server-based machines. UNIX has a high cost and capacity with limited versions because only companies can build new versions.
Versions of UNIX Based Operating Systems: BSD, Iris, HP-UX, AIS
Linux is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds.