Difference Between Unix and Linux Operating System

Unix it is copyright.
Unix it is not free Operating System.

Linux it is free open Source Software.
Linux it is clone of Unix
Linux is Free.
Linux it is most user friendly compare to UNIX.
Linux Security it will come with netfilter /iptables
For UNIX we can install the 3rd party software like check point unix Firewall.

LINUX FILE SYSTEM: Linux it will support ext2 and ext3 file system.
UNIX File System : jfs, gpfs (AIX), jfs, gpfs (HP-UX), jfs, gpfs (Solaris),ufs-Unix File System.
SYSTEM BOOTING START UP SCRIPT
HP- UNIX - /sbin/init.d/
AIX-/etc/rc.d/init.d/
Linux - /etc/init.d/

UNIX OPERATING SYSTEM
HP- UNIX
Sun Solaris
AIX- IBM
MAC OS
IRIX
LINUX OPERATING SYSTEM
Red hat
Cent os
Ubuntu
Fedora
SUSE Enterprise LINUX

	LINUX	UNIX
Find Unix current run Level	Uname –r	showrev
Display running process	Ps –ef,top	prstat
DNS configuration file	/etc/resolv.conf	/etc/resolv.conf
Host file	/etc/hosts	/etc/hosts file link to /etc/inet/hosts
Display Routing Table	netstat –nr route –n 1)Under GPL - General Public License 2)we can install any machine	netstat –nr route –n Unix is unde proprietary we can't install to all the machine. Like Unix HP install only HP Hardware.