What is the difference between Unix and Linux?

Linux is a operating system kernel and UNIX is a certification of operating system or copyrighted name which is used by IBM AIX and Sun Solaris and HP-UX which all are UNIX operating systems. Most UNIX operating systems are commercially used.

Construct of Operating System:

Linux is just a kernel and Linux distribution which includes GUI system , GNU utilities , installation & management tools and many other applications makes linux a complete usable operating systems. Unlike this most UNIX operating systems comes with all the programs needed to make complete operating system. e.g. Solaris, HP-UX.

License and costing :
Linux is a free operating system, also there is a good community support for Linux, Some linux operating systems like Redhat / Novell provides additional support, bug fixing, and training for some additional fees.
Most Unix operating systems are not free.

File Systems
Linux comes with ext3 or ext4 file systems and UNIX AIX, Solaris and HP-UX uses jfs and gpfs.


UNIX is mainly made for mainframes, heavy computing and high end computers while Linux can be from mainframes to personal computers.

Some examples are UNIX operating systems are IRIX, HP-UX, Apple Mac OS, Solaris and IBM AIX.

Some examples of linux distributions (Operating System) are Suse Enterprise Linux, Fedora Linux, Redhat Linux and Ubuntu.
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